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Blood Sweat Tears and Grease => Projects => Cafe Racers => Topic started by: V10Pilot on Mar 11, 2018, 19:30:19

Title: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Mar 11, 2018, 19:30:19
I picked up this '79 Honda CB750L for $200 in non running condition.  I don't have an exact plan just yet but I am going for a cafe/brat setup for sure. I want to be able to get a passenger on the back from time to time so I'm probably leaning towards brat at this point. I am by no means a professional builder/fabricator/mechanic but I'm not completely new to basic mechanical work. I've done motor and suspension work on my 2000 Viper and rebuilt a 2001 Kawasaki ZR-7S back to showroom condition. I'm learning as I go but reading other pages shows me I'm in good company and you guys and gals have a tremendous collective knowledge here.

A few quick points I can think of while I'm writing this first post:

-I bought a set of spoke hubs because I'm not a fan of the Comstar wheels
-The tank is pretty bad but I'm going to try and save it. In the video link you'll see my Fiji bottle tank hanging off the left side.
-The carbs seem to have come from a CB750F. They have VB42B stamped on the side and all the docs I've seen say I should
  have VB42A or VB42C. I don't know if there are major differences between A,B, and C carbs or if they just came from the
  factory with different jets and needles. I'm not sure if running these carbs will make much difference with the (presumed) stock
  motor.
-I'd like to do a full engine tear down and rebuild.
-The electrical and charging system works great at this point but I may upgrade to electronic ignition before I rebuild the bike. (possibly even go with an M-Unit but I'll decide that later)

Is there anything I should measure or check that is easier BEFORE taking the bike apart for the build?

I cleaned and replaced soft parts on the carbs and it seems to be running great for a bike that hasn't been on the road in 10+ years. I bought it from a guy that used to ride it when he lived in Indiana. He brought it with him here to Denver and that's where the bike will live now. I only turned the pilots out two turns to start and it seems to run great. I am however NOT an expert when it comes to carbs so I'll rely on as many sources as I can to figure out the correct setup later.

Link to a video of it running after the carb cleaning and rebuild.
https://youtu.be/347tfYIeaXk
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: cxman on Mar 12, 2018, 07:39:02
the bike already has electronic ignition?
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Mar 12, 2018, 20:31:55
the bike already has electronic ignition?
Iím not sure. I said I was planning on upgrading to electronic ignition if it doesnít already have it.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Mar 12, 2018, 20:44:08
Quick link to a few of my first posts on here.

New member in Denver, CO 1979 CB750K
http://www.dotheton.com/forum/index.php?topic=74981


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jun 16, 2018, 12:39:11
So I finally got around to pulling the motor and building a work table.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jun 24, 2018, 18:53:31
Starting to pull it apart.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: farmer92 on Jun 25, 2018, 06:44:03
Why would you pull the motor apart if it was running?
Was it running badly?
Seals leaking?
Bearing finished?
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jun 25, 2018, 09:34:10
Seals and gaskets leaking, compressions was 125 across all cylinders.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jun 28, 2018, 10:53:50
Head is off and time to clean and lap the valves. There is so much crap in the seats itís no wonder the best I was getting was 125psi. The tensioners still have a little flex but may as well replace the 40 year old plastic while Iím in there. Are you Honda guys using factory gaskets or going with a modern brand during reassembly?


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Maritime on Jun 28, 2018, 11:54:43
OEM for head and base, aftermarket for all the rest is usually fine.  That's the rule on liquid cooled anyway like my GL1000. I paid the price for Honda Head gaskets and bought a full gasket kit to get all the o-rings and valve cover gaskets and seals needed.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jun 28, 2018, 13:26:57
OEM for head and base, aftermarket for all the rest is usually fine.  That's the rule on liquid cooled anyway like my GL1000. I paid the price for Honda Head gaskets and bought a full gasket kit to get all the o-rings and valve cover gaskets and seals needed.
Thanks for the input.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jul 06, 2018, 18:40:36
Each minute of free time leads a little deeper.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Sep 02, 2018, 14:31:15
Engine cleaned, soft parts replaced, tolerances checked, primed and painted. About to make the case whole again. Iím tired of seeing factory silver or black motors so I went with Cast Iron paint. I think I looks pretty damn nice.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: pidjones on Sep 03, 2018, 09:24:37
Careful with the valve lapping. At least on the GL1000, the valves have Stellite faces that are very thin. If there is pitting, best to replace (for the GL1000, they were just $10-15 each). Seats could be ground and lapped (with old valves) however. I love going to other colors on the cases if not a resto. I did POR15 MG Maroon on mine.(https://uploads.tapatalk-cdn.com/20180903/b982f217f088648f079b8597ccaf61f0.jpg)
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Sep 05, 2018, 10:14:52
Careful with the valve lapping. At least on the GL1000, the valves have Stellite faces that are very thin. If there is pitting, best to replace (for the GL1000, they were just $10-15 each). Seats could be ground and lapped (with old valves) however. I love going to other colors on the cases if not a resto. I did POR15 MG Maroon on mine.(https://uploads.tapatalk-cdn.com/20180903/b982f217f088648f079b8597ccaf61f0.jpg)
That motor looks great. More than a 10 min polish job too Iím gonna say! Thanks for the advice on the Stellite. Iím going to have to find out whether or not my valves have the coating.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Nov 28, 2018, 11:51:34
About to go back in the frame now.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: cxman on Nov 28, 2018, 13:05:45
make sure that you have locktited and torqued the hell out of those prone to work loose and make the motor sound like a rod is knocking

starter clutch bolts
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Nov 28, 2018, 16:11:45
make sure that you have locktited and torqued the hell out of those prone to work loose and make the motor sound like a rod is knocking

starter clutch bolts
I plan on it. I still need to rebuild the starter clutch. It made a horrible sound when I would engage the starter but sounded fine after it was running.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: cxman on Nov 28, 2018, 22:29:46
make sure you put in oem honda starter clutch springs

use the real deal i have tried some aftermarket and ebay kits and they fail early
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Coopacoopacoopa on Nov 29, 2018, 17:53:33
Hello from Longmont! Motor is looking good!
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Dec 02, 2018, 16:52:19
make sure you put in oem honda starter clutch springs

use the real deal i have tried some aftermarket and ebay kits and they fail early
Thanks


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Dec 02, 2018, 16:53:04
Hello from Longmont! Motor is looking good!
Howdy. Do you have a bike up there?


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Dec 02, 2018, 16:57:33
Iíve got my vapor blasted parts back and I think this is going to look killer!


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Jimbonaut on Dec 03, 2018, 13:30:30
Hell yes it's gonna look killer - nice work mate!
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Sonreir on Dec 03, 2018, 13:32:23
Coming along well!
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Dec 03, 2018, 17:36:42
Hell yes it's gonna look killer - nice work mate!
Thanks man. I reference your build from time to time. Iím still trying to find the best place to get a frame hoops. It seems most online still need to be bent to get them to fit.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Dec 03, 2018, 17:38:03
Coming along well!
Thank you.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Jimbonaut on Dec 03, 2018, 21:00:31
Thanks man. I reference your build from time to time. Iím still trying to find the best place to get a frame hoops. It seems most online still need to be bent to get them to fit.

I had a friend who has a tube bender make mine for me.  If you don't know anyone in that world then see if you can find a custom bike shop near you - a tube bender is a fairly standard piece of machinery for a bike-building shop.  Good luck man
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Dec 04, 2018, 10:49:57
I had a friend who has a tube bender make mine for me.  If you don't know anyone in that world then see if you can find a custom bike shop near you - a tube bender is a fairly standard piece of machinery for a bike-building shop.  Good luck man
When I lived in southern Louisiana there were oilfield machine shops every block. Up here in Colorado, not so much. Iíll have to search around because Iíd like the pipe to fit perfectly and I think a local shop would be able to give me results based on my exact measurements.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Kunipshun Fit on Dec 04, 2018, 15:31:07
 :o Looks like you are putting in the good work!  That engine looks phenomenal.  Why did you decide not to paint the head? Also, can you tell me what paint you used its gorgeous!!

Can't wait to see more.  Bookmarked.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Dec 05, 2018, 00:20:21
:o Looks like you are putting in the good work!  That engine looks phenomenal.  Why did you decide not to paint the head? Also, can you tell me what paint you used its gorgeous!!

Can't wait to see more.  Bookmarked.
Thanks. A few reasons I didnít paint the head. I like to be different and everyone seems to be polishing or painting them black. I like the natural look and secondly the point of the fins is to aid cooling and coating them with paint will impede that. I would have had them vapor blasted also but I didnít have access to one back when I had the head apart. Oh well.
The paint is by VHT and called Cast Iron. Itís not a 2K paint so Iíll have to accept the durability isnít going to be great but I do plan on coating it with a high temp clear coat made by Eastwood called Exo Armor and that should help. Iíll report back after I get the bike on the road early next year.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Jimbonaut on Dec 05, 2018, 11:21:05
Thanks. A few reasons I didnít paint the head. I like to be different and everyone seems to be polishing or painting them black. I like the natural look and secondly the point of the fins is to aid cooling and coating them with paint will impede that. I would have had them vapor blasted also but I didnít have access to one back when I had the head apart. Oh well.
The paint is by VHT and called Cast Iron. Itís not a 2K paint so Iíll have to accept the durability isnít going to be great but I do plan on coating it with a high temp clear coat made by Eastwood called Exo Armor and that should help. Iíll report back after I get the bike on the road early next year.

Good point.  I'm about to start tearing down my next 750, and although the engine has excellent compression (not much need to tear the engine apart) the casings themselves are looking a little ratty.  I'd love to paint it but right now just weighing up my options.  Interesting take on why not to paint the head.  I wonder how much effect painting would have on the cooling - with all the air rushing through the fins and between the cylinders I genuinely do wonder whether the paint (or lack thereof) would affect the cooling much. 

I've used Eastwood paint before - they make some excellent 2K clear which I've used on a couple of tanks with great results.  I'll be interested to hear how their Exo Armor holds up.  Well no doubt.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Kunipshun Fit on Dec 05, 2018, 11:42:15
Interesting indeed about the paint affecting cooling of the head.  I cant imagine it would do much considering paint isnt much of an insulator, but who knows for sure?!!
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Dec 05, 2018, 15:17:11
Iím not using exact scientific number to prove the cooling or lack of cooling but if you put a layer of paint on a surface itís going to hinder it slightly. Even if it does it would be just a few degrees and that wouldnít matter on an old Honda motor. I just wanted to keep it bare because everyone seems to be painting their heads and I like my stuff to stand out.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: wozza on Dec 05, 2018, 19:09:30

Black absorbs heat pulling it away from the internal parts and then the air passing over fins remove the heat.....Not a lot of temp difference between polish/light colors and black ...but a measurable difference all the same.Plenty of discussions on the subject around the net....and difference of opinions :)   
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Dec 05, 2018, 23:17:21
An interesting article from an aeronautical thermodynamicist regarding the subject. Some parts donít apply because the engine isnít in an enclosed cowling:

Some overhaul shops claim beneficial cooling effects of black paint on their engine. The theory is that black is a better emitter of infrared (heat) energy. A hot engine in a cold surrounding, radiates energy from the hot object to the cold. The amount of radiant cooling (thermal emissions) is generally dependent upon the temperature of the emitter (engine) and how efficient the engine is at radiating energy ó its emissivity. This derives from Kirchoff's Law where good absorbers are also good emitters. Since black is a good absorber of energy (that's why it's black), it's also a good emitter. A black object emits more radiant energy (cools faster) than a white or gold object that emits less radiant energy per unit of time. Painting an engine black increases the amount of radiant energy emitted by the hot engine to its colder surroundings and it will be cooler than a non-black engine.

There are fallacies to the above argument. Most heat energy emitted by the engine is in the invisible infrared portion of the spectrum. What appears to us as black, white, red, or green in the visible spectrum is not what we would see in the infrared spectrum. Any color of paint that uses organic (non-metallic) pigments is black in the infrared spectrum. For example, white paint emits 90-95% depending upon pigment type. Black emits 96%, blue 94%, green 92% and red 91%. The best emissivity surface coating is acetylene soot at 97%. Painting an engine increases radiant cooling but the color of the paint doesn't.

The second fallacy is that you also have to ask what happens to the radiant energy being emitted by the engine. Engine cowlings with bare aluminum on the inside reflect about 95% of the radiant energy back to the engine where the black paint of the engine absorbs at the same high efficiency as it emitted. Black paint has high absorbency and high emittance. Better would be white paint that has low absorbency and high emittance. An engine contained within a bare aluminum cowling should be painted white not black to reflect the radiant energy back to the cowling. Another technique would be to paint the inside of the cowling black to eliminate reflection of heat energy. If the aircraft had a plastic cowling then the engine need not be painted white because of the low reflectance of plastic.

Most heat from the engine is transferred to the atmosphere by convection rather than by radiation. Radiant cooling of an engine is negligible. Engines run quite nicely no matter what color they're painted. Now when you're at that trade show and the engine shop salesman is talking performance and how his paint scheme helps cool the engine just tell him that his black engine is the same color as a red, white or blue engine ó in the infrared spectrum.

Although engines get all the attention, the engine compartment can be engineered to better manage temperature. The engine compartment is one of the most heat damaging environments there is. Packed in the same compartment are glowing exhaust components, rubber products, electronics, wiring, pumps and magnetos. Little effort has been made at controlling heat exchange by changing the infrared emissivity and reflectivity of components. Small changes, such as the addition of reflective heat shields, can be very effective.

Engine mounts are often corroded where they pass next to an exhaust pipe. Mounts painted with dark shades of organic pigmented paint efficiently absorb radiant energy causing the mount to get hot, burn the paint, and cause corrosion. Black or white paint is all the same as far as emissivity or cooling a hot object. However, when keeping an object colder than its surroundings, such as a mount section next to an exhaust stack, we need to reflect the radiant energy and not absorb it. In this case white paint reflects more radiant energy than black paint. A metallic pigmented paint, such as aluminum, is even better yet.

Another method of keeping objects cool in a hot environment is by using heat shields that reflect radiant energy. Small shields made out of aluminum or stainless steel are highly reflective not only at visible wavelengths but well down into the infrared. Your mechanic may be able to fabricate these small heat shields or contact me for pre-fabricated shields.

Aircraft, such as some Aerostar's, use heat shields to keep the magneto cool. We may be able to forgo the shield and add the reflective properties of the shield to the surface of the magneto. For this we want the magneto surface to have high reflectivity to bounce radiant heat off and we want high emissivity to radiate heat out of the magneto.

Bare aluminum or a metallic pigmented paint would not be desirable because it has high reflectance but low emissivity. Black paint, as most magnetos are painted, also is not desirable because it has high emissivity but poor reflectance. A white organic pigmented paint is best because it has both high emissivity and high reflectance.

Painting engines black is more effective as a sales tool than it is at cooling an engine. However, the concept of regulating temperature within an engine compartment by controlling radiant energy can be both effective and easily and inexpensively applied.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Dec 09, 2018, 12:56:56
Fresh gaskets and cleaned up oil pump.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: esmoojee on Dec 09, 2018, 18:50:16
Or find an r6 starter clutch and do swap that will outlast the motor.  https://www.youtube.com/watch?v=sYJSUiXDim8  I did it on my 750 and never had another problem.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Dec 19, 2018, 11:05:55
A little more progress. Just need to weld her up and paint the frame with fresh 2K primer and gloss black. Then the motor can go back in.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Jimbonaut on Dec 19, 2018, 11:34:12
Looking good fella, feels great getting the hoop on!  Glad you found someone to make it for you, looks perfect.

And damn I'm jealous of your weather.
Title: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Dec 19, 2018, 18:32:22
Or find an r6 starter clutch and do swap that will outlast the motor.  https://www.youtube.com/watch?v=sYJSUiXDim8  I did it on my 750 and never had another problem.
Thanks. He didnít mention what year range R6


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Dec 19, 2018, 18:45:33
Looking good fella, feels great getting the hoop on!  Glad you found someone to make it for you, looks perfect.

And damn I'm jealous of your weather.
I looked high and low for someone local but they all wanted close to $150. I just went on amazon and bought one for $30 and had to tweak it just a tad to make it fit but not much. Iím finding Colorado has some crazy weather swings. One day itís sunny and 55į then wake up to snow. Then two days later itís sunny and still in the 50s.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Dec 31, 2018, 20:06:42
I was hoping to be further along by now but itís been hanging around 15įF (-9įC) during the day. I got a little grinding done on the hoop welds and got the basement warm enough to get the first coat of primer. Iím using Eastwood 2K Aero-spray epoxy primer. It looks good so far.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jan 11, 2019, 18:25:42
Paint is done! Time to hang the motor.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Jimbonaut on Jan 11, 2019, 18:45:51
Looking great


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jan 16, 2019, 10:25:07
Looking great


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Thanks man. Itís a slow process because family and work take up most of my time and the bike gets a few hours a week at most. But with winter fully settled in now itís forced me to take my time and not rush because I canít go ride it anyways. I think Iíll end up with a nicer bike because of it


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jan 16, 2019, 10:30:53
Starting to look like a motorcycle again. Sadly I wonít have time to touch the bike for the next three weeks.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: pidjones on Jan 16, 2019, 16:53:42
Looking very good. Stepping away for a while can be a good thing.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: enterlance on Jan 22, 2019, 18:51:37
May I ask how did you fit the engine into the frame? I myself is working on a similar bike (1980 CB750F DOHC) and on the stage of mounting the engine. I will have a friend coming this weekend to help but I wonder if it possible to do it solo.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jan 23, 2019, 14:06:25
May I ask how did you fit the engine into the frame? I myself is working on a similar bike (1980 CB750F DOHC) and on the stage of mounting the engine. I will have a friend coming this weekend to help but I wonder if it possible to do it solo.
I took the engine out while the bike was on the center stand and used a motorcycle jack and a few pieces of wood to support the motor then slid it out the right side.

To get the motor back in was much easier because the frame was by itself after  painted it so I had the motor sitting on the table and just lifted the frame onto the engine. Both times I was by myself.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: jordandogtown on Jan 23, 2019, 14:55:30
Paint turned out great man. I understand the struggle of having to paint in a basement in the winter.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jan 23, 2019, 16:14:16
Paint turned out great man. I understand the struggle of having to paint in a basement in the winter.
Thanks. I started the first epoxy primer coat in the basement because it was 3į then two days later it was 62į and blue skies so I finished up out in the garage. Denver has some crazy weather swings.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: jordandogtown on Jan 23, 2019, 16:21:01
Thanks. I started the first epoxy primer coat in the basement because it was 3į then two days later it was 62į and blue skies so I finished up out in the garage. Denver has some crazy weather swings.


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I hear ya, same way in Kentucky. I'm trying to force myself to wait until Spring (although equally unpredictable) but it's going to be tough.

How easy did the epoxy go on? I haven't had any experience with it in aerosol form before
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: pidjones on Jan 23, 2019, 20:12:53
At least the humidity should be lower in Denver.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Popeye SXM on Jan 23, 2019, 21:33:44
Looking great. I have high humidity which makes a getting a smooth finish very difficult. Really enjoying, keep the pics coming
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: enterlance on Jan 28, 2019, 14:08:31
I took the engine out while the bike was on the center stand and used a motorcycle jack and a few pieces of wood to support the motor then slid it out the right side.

To get the motor back in was much easier because the frame was by itself after  painted it so I had the motor sitting on the table and just lifted the frame onto the engine. Both times I was by myself.


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Thanks! Got the engine in (with a friend's help though). It wasn't that hard at all, just needed another person to help out lining up the bolts as I don't wanna scratch the frame paint. But you are so good and strong enough to do that yourself! Much respect.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: esmoojee on Jan 28, 2019, 18:42:50
Itís been a while since I was here. The part number for the r6 is in the comments section of the video I shared.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Feb 01, 2019, 15:49:23
I hear ya, same way in Kentucky. I'm trying to force myself to wait until Spring (although equally unpredictable) but it's going to be tough.

How easy did the epoxy go on? I haven't had any experience with it in aerosol form before
The epoxy primer and paint laid down very well. It was about 55įF and 20% humidity but the the guy I called at Eastwood said I should sit the cans in warm to hot water for about 15 minutes before spraying. Iím very happy with the results. I cleaned the surfaces well but didnít smooth out factory imperfections in the metal so any small bumps or ridges are from that not the paint.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: jordandogtown on Feb 01, 2019, 16:06:41
Man that turned out so good. I didn't think about the warm water trick. I'll definitely try that when I get there
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Jimbonaut on Feb 01, 2019, 16:10:55
Looking good man, nice work
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: dwysywd on Feb 08, 2019, 10:56:27
your attention to details has been great. I really liked the article you published on the paint scheme. That was educational. I always wondered about that. Your epoxy frame paint looks great too.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: pidjones on Feb 08, 2019, 17:18:46
It was cool (lower 60's) when I did the 2K rattle can clear on my GL1000. Warmed the can in hot water and applied according to instructions. Was afraid it had screwed up royaly because it was milky with runs and looked awful. Maritime and others couseled that as it cured the milky would go away - and it did. They also counseled that the runs and sags would wet sand out and polush up great - and they did.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: cb250nproject on Feb 10, 2019, 06:19:28
Very cool build, looking forward to see how it evolves


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Mar 02, 2019, 13:46:41
Like usual I had part of a day to get a few things done but nothing major. I stripped and painted the swing arm, lower fork clamp, rear brake, and some other small parts. I also had to repair a stripped thread in the head. I went with a heli-coil system. Iím also about to dig into the electrical system for the motor then on to the rest of the M-unit blue.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: dwysywd on Mar 12, 2019, 14:54:25
Iím not using exact scientific number to prove the cooling or lack of cooling but if you put a layer of paint on a surface itís going to hinder it slightly. Even if it does it would be just a few degrees and that wouldnít matter on an old Honda motor. I just wanted to keep it bare because everyone seems to be painting their heads and I like my stuff to stand out.


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Actually, there was a guy on this forum (i think) that did a whole paint analysis, I believe he said he was a paint engineer. It was some time ago and I don't have the specific link, but painting the fins doesn't have any significant influence or insulation to the fins. To paint or not to paint is a vanity question not a physics question.

Btw, love the build. and I like what you did with the color scheme on the engine. I left my raw after cleaning it. I never repainted it. I hate the process, like others have said, PITA. So better that I didn't paint this one. I might build another bike after this one is over and paint that one, mainly its a complete tear down and rebuild of a non running engine. The vapor blasting looks amazing.
Title: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Jimbonaut on Mar 12, 2019, 17:51:10
Shaping up very nicely fella.  Helicoils are the business.  I had to use one for a stripped cam chain tensioner thread - sweaty palm time but damn those things work great.  Watching your (and a few other 750 builds at the moment) is an education as I'm working on a smilier bike right now too.  Watching with interest!

Edit - Iím working on a similar bike. Itís in no way smilier.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Mar 13, 2019, 10:13:38
Actually, there was a guy on this forum (i think) that did a whole paint analysis, I believe he said he was a paint engineer. It was some time ago and I don't have the specific link, but painting the fins doesn't have any significant influence or insulation to the fins. To paint or not to paint is a vanity question not a physics question.

Btw, love the build. and I like what you did with the color scheme on the engine. I left my raw after cleaning it. I never repainted it. I hate the process, like others have said, PITA. So better that I didn't paint this one. I might build another bike after this one is over and paint that one, mainly its a complete tear down and rebuild of a non running engine. The vapor blasting looks amazing.
There was an article I put up somewhere in my post written by an aeronautical engineer on cooling performance that was pretty interesting. The chemical makeup of the paint plays the biggest role. Some paints result in a blanket effect while some actually dissipate infrared heat better than no paint at all.  But yeah Iíll agree with you that when it comes to an old Honda motorcyle, the effects are nil. A few degrees this way or that way arenít going to suddenly make a race engine or an underpowered turd. Itís about the look.

Thanks. The color came out great but Iím already wishing I hadnít used VHT. That stuff is garbage. I followed all the instructions for priming and painting and thoroughly prepped the metal before I sprayed the primer. It is not durable in the slightest and will chip easily. I dropped a small socket on the cam cover from no more than 2 feet and it left a chip about 5mm. The frame came out great and I couldnít be happier. I used a 2K rattle can epoxy primer and paint. I sprayed a test plate with the left overs and itís durable.

The vapor blasting is incredible. It micro peens the surface of the aluminum and closed the pores and gives a durable velvet look.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Mar 13, 2019, 10:19:02
Shaping up very nicely fella.  Helicoils are the business.  I had to use one for a stripped cam chain tensioner thread - sweaty palm time but damn those things work great.  Watching your (and a few other 750 builds at the moment) is an education as I'm working on a smilier bike right now too.  Watching with interest!

Edit - Iím working on a similar bike. Itís in no way smilier.
I used your build as reference more than once so thanks for that. Yeah the Helicoils worked as advertised. Too bad the tap and install tool are priced like they are made of silver. I think Iíll strip a few more threads just to get my moneyís worth

Have you posted your new project yet?


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Maritime on Mar 13, 2019, 10:19:43
On the VHT, it's not durable until cured if it was the high heat engine paint. if you don't bake it or cycle the engine to cure it, it's pretty easy to damage it. after cured it's usually ok. That being said the 2K is 100X better paint.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Jimbonaut on Mar 13, 2019, 10:28:27
Have you posted your new project yet?
Ha ha, yes.  It's in the Restorations section, which is a total joke as it as much a restoration project as I am Alicia Vikander's dream date.  You can find it under the title The Resto-not.
Title: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Mar 13, 2019, 10:28:43
Starting to look like a bike again
Donít judge me on my dirty rear shocks. They are the originals just holding up the rear until I decided which shiny new setup I want.

Iíve got the engine side of the wiring harness split away from the rest of the crusty old bunch. Wonít need the rest of it with the M-unit blue going in. That was an exercise in patience.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Maritime on Mar 13, 2019, 10:45:27
Nice, Honda seems to love to use way more wire and connections than required on their harnesses. You can slim them down a lot like you did.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: CrabsAndCylinders on Mar 13, 2019, 15:32:33
This is a cool build to follow, nice work!

I remember back in the day, guys used to paint the engines flat black, thinking it helped to cool the engine, I know I did.  I would like to read the post mentioned above, I'm curious as to the real effects, if any. 
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: CrabsAndCylinders on Mar 13, 2019, 15:40:16
In this write up, it mentions that Grumpy Jenkins (a famous engine builder and drag racer from the 70's) used to paint his engines black and the engine compartment white.

https://www.jalopyjournal.com/forum/threads/grumpy-jenkins.182784/page-10
Title: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Mar 16, 2019, 02:13:28
So I think Iíve got the wiring for the engine side of things all figured out. Iíve spent a lot of time looking through the electrical flow but if anyone sees any fatal errors call them out. This doesnít include separate power distribution and grounding blocks that Iíll draw in later.

There are a few scribbles when I forgot where I was in the layout so itís not as pretty as it could have been.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Mar 19, 2019, 11:08:57
Letís get this party started


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: cb250nproject on Mar 19, 2019, 11:59:28
Good luck, itís rewarding when all the switches do what you intended them to do


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: canyoncarver on Mar 19, 2019, 13:21:37
Nice work so far man.  Nice attention to detail too.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Mar 27, 2019, 01:33:07
Got the new isolators and boots on and temporarily connected the M-Unit Blue. I wish the very first thing I did when I was working on this bike before the build was but factory fresh rubber parts. The carbs pop on and off SO easily compared to the rock hard crap thatís been on there since the 70s.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Mar 27, 2019, 23:23:29
Well she fired right up without hesitation!!! New homebuilt harness works! The M-unit blue works! The engine didnít explode! The rebuilt and vapor blasted carbs work! All this is such a relief. Now on to sourcing new controls, making the tank look pretty, and mounting the M-unit in a permanent location.
https://youtu.be/ZvjWqZD_BqM


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Nybz on Mar 28, 2019, 03:11:11
One of the best feelings! Congrats on a runner!


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: pidjones on Mar 28, 2019, 07:21:11
Doing the happy dance! Valve clearances checked? The experts recommend .004 - .006". I've put ~140 miles on my 750F, and it is still static-timed, but I plan to re-check the valve clearance to see if they have changed. Gosh, those new isolators look nice!
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: trek97 on Mar 28, 2019, 20:50:36
Gotta be happy about that!   8)

The build is looking super.  Nice work dude.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Jimbonaut on Mar 28, 2019, 22:11:38
Right on!
Title: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Apr 21, 2019, 00:24:38
On to the rest of the wiring for the M-unit blue. I made a small aluminum bracket to mount the m-unit and I need to figure out where Iím going to mount the grounding block. Running the input and output wires then Iíll clean it up into another harness and add waterproof connectors on each end so I can unplug the harness if needed later. Just got the Motone buttons in today and I like them. Quality is just as good as the Motogadget buttons but cheaper (not cheap though). Trying to figure out the best length throttle cables for my lower controls with the clubman bars.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: cb250nproject on Apr 21, 2019, 06:49:10
Awesome work


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: pidjones on Apr 21, 2019, 08:17:12
Looking like progress. On the stock throttle cables, they are routed on the LEFT side of the headstock, and over the TOP of the tank rubber receivers.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Apr 21, 2019, 10:28:37
Looking like progress. On the stock throttle cables, they are routed on the LEFT side of the headstock, and over the TOP of the tank rubber receivers.
Yeah the stock cables are run that way but with the clubman bars they are too long and stick out the front of the bike. I ordered a new throttle to get rid of the stock buttons and also bought cables for an earlier year CB750 since they are shorter. Iíll see if it works when they come in next week 🤞🏼


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Jimbonaut on Apr 21, 2019, 12:16:54
Looking really clean man, enjoying watching this all come together!
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: pidjones on Apr 22, 2019, 08:26:01
The stock cables tun that way to allow the forks to turn without interference, and without changing the throttle operation. Also to prevent pinching or too-tight bends going over the top of the motor and through the tank tunnel. But whatever, make it pretty I guess.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Apr 22, 2019, 09:42:42
The stock cables tun that way to allow the forks to turn without interference, and without changing the throttle operation. Also to prevent pinching or too-tight bends going over the top of the motor and through the tank tunnel. But whatever, make it pretty I guess.
I understand all that. I donít have stock high rise bars anymore. The clubman bars bring the controls much closer to the neck so I ended up with a lot of extra slop in the cables that sticks out way past the headlight. I bought shorter cables to effectively give me the stock amount of slack with lower bars.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: pidjones on Apr 22, 2019, 09:48:00
Shorter cables is understood. They still need proper routing.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Apr 27, 2019, 09:47:55
Cables and new throttle in place and they fit perfectly. New paint on the header and new copper crush rings. The airbox is in place because I want to to run the right way and the carbs are running oh so sweetly
https://youtu.be/TfLPCXZhrVQ


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: trek97 on Apr 27, 2019, 10:17:09
Super clean and super work going on here.

Nice job.  8)
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Jimbonaut on Apr 27, 2019, 12:03:55
Right on, really looking (and sounding!) good.  I like how you've left the cylinder block unpainted while everything else is looking so clean, pretty cool contrast.  Pretty close to getting this beauty on the road?
Title: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Apr 27, 2019, 15:07:14
Right on, really looking (and sounding!) good.  I like how you've left the cylinder block unpainted while everything else is looking so clean, pretty cool contrast.  Pretty close to getting this beauty on the road?
I wanted it to be a little different and I liked the look of some bare metal. Hoping to be done in a month. I need to figure out what Iím going to do about a seat. Iíll have to make my own.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: pidjones on Apr 28, 2019, 09:34:41
Wise choice to stick with stock airbox and filter. Improving the looks of the airbox is a challenge that someone needs to take on.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: trek97 on Apr 28, 2019, 09:46:10
Wise choice to stick with stock airbox and filter. Improving the looks of the airbox is a challenge that someone needs to take on.

Im learning to look beyond stock airboxes and appreciate the bigger picture of a finely tuned and reliable machine.

Its much easier to accept function over appearance.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Apr 28, 2019, 12:38:27
Iím going to ride it this season with the airbox and when itís time to put it away for the winter Iím going to do some testing. I have an idea to maintain the required vacuum and laminar flow these carbs need to run properly through all phases of throttle. I donít care how something looks if it doesnít operate properly if useless to me.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Kunipshun Fit on May 07, 2019, 15:49:10
Excellent work so far! 
Title: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on May 14, 2019, 16:07:45
More wiring yay
Itís a time consuming process when you do it right. All joints will be soldered and sealed.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on May 21, 2019, 14:14:13
Tying to visualize a full leather two person seat with the back half ďcafeĒ hump styled instead of just flat.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on May 21, 2019, 14:15:55
Also considering making the rear fender into a hugger style. I think that would look killer.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Jimbonaut on May 21, 2019, 14:26:29
Yup, digging both those styling cues.  The two-up seat looks great (and could work well with the lines of the rear subframe), and the hugger fender could definitely work too.  For some reason I think having the fender end directly below the end of the seat hoop accentuates the gap between the two - I'd love to see how it looks with the fender tucked away more just as a comparison.  Damn that fender's nice and shiny!
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on May 27, 2019, 21:52:05
Yup, digging both those styling cues.  The two-up seat looks great (and could work well with the lines of the rear subframe), and the hugger fender could definitely work too.  For some reason I think having the fender end directly below the end of the seat hoop accentuates the gap between the two - I'd love to see how it looks with the fender tucked away more just as a comparison.  Damn that fender's nice and shiny!
Jimbo, here are a few different amounts of tuck on the fender. Iím thinking tucking it in deep then making a small black or carbon fender about 3 to 4 inches attached under and sticking out from the rear hoop(see example). Iíd need that little fender on the hoop to keep from getting water up my back if I tuck the chrome hugger too deep.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on May 27, 2019, 22:01:35
Got my new valve clearance numbers after the rebuild and they are a little tight but still ok. I may ride this season and add it to the list for next winters work.

I also pulled the carbs back off because itís not running right between 1/4 to 3/4 throttle. Starts to burble and lose power. A few carb experts are telling me itís too rich so Iíve got a few genuine Keihin jets coming with a few sizes to do some testing. It has 68/102 now but when I do the idle drop procedure Iím ending up with pilot screws turned nearly 4 out and the plugs are sooty.

I also used this as an excuse to pull the started motor out and clean and re lube the shafts. There was a horrible noise coming from the started motor and now it purrs

I still and stumped on what to do about a seat and side covers. Those covers are hard to come by and everyone wants crazy $$$ for them if they arenít cracked.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: cb250nproject on May 28, 2019, 08:01:35
.003 and .004 might cause you some dramas, better to be loose than tight. I bent an exhaust valve from not having enough clearance. But if itís already running maybe sheís all good.
Iím digging that rear fender looks mean.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jun 12, 2019, 14:08:03
Iíve been so busy with work, this project has slowed more than I hoped. I got a few sizes of jets and Iíll start with the 98s to see if that helps the burble and sooty plugs.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: pidjones on Jun 12, 2019, 22:14:41
Cracked side covers are easy fixed with ABS plumbing cement and a little fiberglass cloth on the inside if you think reinforcement is needed.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jun 14, 2019, 18:55:11
Cracked side covers are easy fixed with ABS plumbing cement and a little fiberglass cloth on the inside if you think reinforcement is needed.
My covers are completely missing the tabs on the back that plug into the rubber grommets on the frame


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jun 14, 2019, 18:58:38
Well the 98 jets seem to be the ones! Running like a top. Starts easily, idles great, revs donít hang, pulls strong and linear all the way through, and doesnít pop on decel.
https://youtu.be/vv_xBSRYgqY
https://youtu.be/FNm6LhYCRiI


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jun 15, 2019, 12:30:56
Seat pan is done now itís time to cover it and move on to the tank.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: trek97 on Jun 16, 2019, 12:01:06
I'd clear coat that tank and leave it as is. 

AND it sounds great.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jun 16, 2019, 15:20:12
I'd clear coat that tank and leave it as is. 

AND it sounds great.
After all this work there is no way Iíd leave this shit tank like this.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: trek97 on Jun 16, 2019, 16:18:32
After all this work there is no way Iíd leave this shit tank like this.

LOL Dude!  I suppose, Beauty is in the eye of the beholder.  Eh?
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: trek97 on Jun 16, 2019, 16:21:56
How clean is the inside of that tank? 

Does it hold gas? 
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jun 16, 2019, 18:49:46
How clean is the inside of that tank? 

Does it hold gas?
It looks brand new inside and it holds gas without leaks. This tank came off an 81K, same as the wheels. The tank that came with my bike  had dime sized rust holes so I had to find something elseís. I still really want to find a CB650 tank from the same year.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jun 18, 2019, 12:24:31
Working on the seat now. Not perfect but not too bad for never using a sewing machine in my life.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: advCo on Jun 18, 2019, 12:28:35
Nice job on the seat.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Jimbonaut on Jun 18, 2019, 13:06:29
Very nice indeed
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: trek97 on Jun 18, 2019, 14:37:00
Thatís an awesome job. 

Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jun 24, 2019, 01:38:38
Well I had an issue while sewing the skirt on the top cushion and had to scrap the whole thing. The machine ate the leather. I decided as much as I like the diamond stitch, itís a little played out. I may revisit it again later but Iím going to try this pattern. I was looking for design inspiration and came up with this retro futuristic layout. I hope I have better luck with the skirt this time. That was friggin frustrating having to throw away all that work.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: trek97 on Jun 24, 2019, 08:27:43
The new top is looking cool.

Seat covers can be difficult and frustrating work.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Maritime on Jun 24, 2019, 08:30:57
That's funky. Might look pretty good. It's easy to do the lines in the leather with most machines but you need a pretty robust one to start going through the multiple layers when you attach the skirting part. Also make sure the needle is for leather, makes a big difference.
Title: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jun 24, 2019, 20:58:53
Thanks guys. Iíll probably make another seat so I can swap between brat and cafť depending if I have a passenger. Iíll do the single as diamond pattern again.
The issue wasnít with the needle punching the leather, it was with the bobbin mechanism getting all knotted up and winding itself so tight and pulling the leather down into the machine. I worked for half an hour to free it up but had no choice but to cut the leather the get access to free it.  It it was my very first attempt at sewing and seat design so I shouldnít have expected perfection. Either way I learned a lot and this new seat is coming along nicely with no flaws so far. Iím getting a feel for machine settings and the way the materials want to be worked.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: sandmanred on Jun 25, 2019, 07:18:33
Looks great so far!

When the thread balls up in the bobbin area it's likely the top thread tension too low.  For a good stitch the top thread ends up getting looped all the way around the bobbin and then the loop gets yanked back up to finish the stitch by that arm the pulls up on the thread fed from the upper spool.  When the upper tension is too low the arm can't yank the loop up tight and it leaves that hairy mess that balls up in the bobbin area.  It's always good to make a practice run on something pretty similar to the stack you are trying to sew to check your stitch quality.  Tension adjustments can be necessary when what you are sewing changes.

Youtube also has some great videos on solving tension problems, you can probably even find them specific to your machine.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jun 26, 2019, 08:56:14
Thanks for the tip sanmanred. I found I had the tension wheel set too low and once I tightened it up, the stitches cleaned up and the machine hasnít jammed again (yet).


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Title: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jul 01, 2019, 21:46:33
Took a break from the CB and rode the ZR-7S up Mt. Evans 14,130ft (4,307m). Highest paved road in North America.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: trek97 on Jul 01, 2019, 22:44:10
Wow that's so nice.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jul 12, 2019, 20:52:48
Seat is complete!


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Jimbonaut on Jul 12, 2019, 21:11:57
I honestly think it'll be a cold day in hell before I try to stitch my own seat.  Kudos man, nicely done.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jul 12, 2019, 21:22:39
I honestly think it'll be a cold day in hell before I try to stitch my own seat.  Kudos man, nicely done.
A lesson in frustration for sure. I started to pick up tricks and techniques and it got easier to get what was in my brain to the real world. Itís still not perfect but after all the work I did on the mechanical portion, it would have felt like cheating to pay someone else to make me a seat. I still need to make another one for single seat cafe riding.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: cbrianroll on Jul 13, 2019, 01:33:41
Looks good! Look into a roller foot adapter for your machine also....helps it go a bit smoother...always use a fresh needle too....be careful going too big of needle or your holes will be bigger than your thread.check out leatherworker.com for good info on leather sewing, needle and thread types and sizes.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jul 14, 2019, 17:37:51
Shakedown run. All seems to be working so far


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Jimbonaut on Jul 19, 2019, 15:04:15
Cool man, well done - I'd love to see some more photos!
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: trek97 on Jul 20, 2019, 07:13:19
(http://www.dotheton.com/gallery/11494-200816163635.png)
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jul 20, 2019, 13:33:54
Took it out for a quick evening cruise.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: pidjones on Jul 20, 2019, 16:00:13
Nice photography. I like that you retained fenders. You can ride when roads are wet without pumping water up your nose.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Jimbonaut on Jul 22, 2019, 14:38:08
Looking good man, got any profile shots?  I'd love to see this looker in daylight too, but these photos are indeed great
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Georgelogue on Jul 25, 2019, 07:55:44
I purchased a 79 cb750L in march... im into the wiring of the munit basic.... straight up stealing your wiring diagram!  thanks and super appreciative of all the documenting!  great looking bike.
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jul 25, 2019, 13:47:24
Thanks guys. I still have a few small items to tidy up but Iíve put about 200 miles on it so far. I will probably repaint the tank a very dark green this winter.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jul 25, 2019, 13:49:15
I purchased a 79 cb750L in march... im into the wiring of the munit basic.... straight up stealing your wiring diagram!  thanks and super appreciative of all the documenting!  great looking bike.
Go for it. I was helped along with my build by looking at work other had done before me so itís only right to help the next guy.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: advCo on Jul 25, 2019, 13:58:05
Looking great, I nominated you for BOTM.  8)
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Jul 25, 2019, 14:11:45
Looking great, I nominated you for BOTM.  8)
Wow thanks


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Jimbonaut on Jul 29, 2019, 17:57:52
Congratulations on the BOTM nomination mate, well deserved!

Kung-fu grips, in oxblood no less.  My man  8)
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Aug 02, 2019, 12:29:45
I know itís pretty common but it still sucks. I had a hanging front brake and found this pitting during disassembly.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Jimbonaut on Aug 02, 2019, 12:42:18
Check out BrakeCrafters online and ask for Mark.  He'll do you right
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Aug 02, 2019, 13:16:51
Also this torn rubber sleeve Iíll have to source. I didnít see it on any of the standard parts sites Iíve been using.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: Jimbonaut on Aug 02, 2019, 13:26:54
Ditto - ask Mark
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Aug 02, 2019, 14:23:12
Check out BrakeCrafters online and ask for Mark.  He'll do you right
Thanks Iíll check it out.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: cxman on Aug 02, 2019, 18:26:23
https://www.davidsilverspares.com/CB650Z/part_319226/

is where i get them
Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: V10Pilot on Aug 16, 2019, 13:10:20
Front brake is done. The local Ferrari shop vapor blasted the parts to match the engine covers they did earlier. Repainted and rebuilt the master and installed a braided line. Rebuilt the brake and am leaving it bare.


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Title: Re: 1979 CB750L. My first cafe/brat project. Denver Area
Post by: trek97 on Aug 16, 2019, 23:15:50
Very nice and clean work my man.