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Author Topic: 1979 CB750L. My first cafe/brat project. Denver Area  (Read 2482 times)

Offline V10Pilot

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1979 CB750L. My first cafe/brat project. Denver Area
« 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.
1979 Honda CB750L
2001 Kawasaki ZR-7S

Offline cxman

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Re: 1979 CB750L. My first cafe/brat project. Denver Area
« Reply #1 on: Mar 12, 2018, 07:39:02 »
the bike already has electronic ignition?
1978 CX650 Super Deluxe
1979 XS1100 Special
1974 xl350
1983 cx650 Custom
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1974 kawasaki 350 bighorn
1983 GL1100 aspy full dress
1983 GL1100 Nekid
and a bunch of others

Offline V10Pilot

  • Posts: 49
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Re: 1979 CB750L. My first cafe/brat project. Denver Area
« Reply #2 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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1979 Honda CB750L
2001 Kawasaki ZR-7S

Offline V10Pilot

  • Posts: 49
    • My YouTube Channel
Re: 1979 CB750L. My first cafe/brat project. Denver Area
« Reply #3 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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1979 Honda CB750L
2001 Kawasaki ZR-7S

Offline V10Pilot

  • Posts: 49
    • My YouTube Channel
Re: 1979 CB750L. My first cafe/brat project. Denver Area
« Reply #4 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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1979 Honda CB750L
2001 Kawasaki ZR-7S

Offline V10Pilot

  • Posts: 49
    • My YouTube Channel
Re: 1979 CB750L. My first cafe/brat project. Denver Area
« Reply #5 on: Jun 24, 2018, 18:53:31 »
Starting to pull it apart.


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1979 Honda CB750L
2001 Kawasaki ZR-7S

Offline farmer92

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Re: 1979 CB750L. My first cafe/brat project. Denver Area
« Reply #6 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?

Offline V10Pilot

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Re: 1979 CB750L. My first cafe/brat project. Denver Area
« Reply #7 on: Jun 25, 2018, 09:34:10 »
Seals and gaskets leaking, compressions was 125 across all cylinders.


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1979 Honda CB750L
2001 Kawasaki ZR-7S

Offline V10Pilot

  • Posts: 49
    • My YouTube Channel
Re: 1979 CB750L. My first cafe/brat project. Denver Area
« Reply #8 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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1979 Honda CB750L
2001 Kawasaki ZR-7S

Offline Maritime

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Re: 1979 CB750L. My first cafe/brat project. Denver Area
« Reply #9 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.
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
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