DO THE TON

Blood Sweat Tears and Grease => Projects => Trackers => Topic started by: travisvisual on Jun 26, 2015, 18:06:49

Title: 73 CB100 Tracker Build
Post by: travisvisual on Jun 26, 2015, 18:06:49

Like many of you, I have been lurking on here for awhile. I have finally made some progress so I figured why not start a build thread.

Bought my 1973 CB100, with a spare motor back in Oct. 14 or so in LA. I live in LA and have been chipping away on the little guy since then.  This is my first build, I have tinkered with dirt bikes and made some mods on my Ducati Sport Classic when I had it but that's about it.

My name is Travis, i'm a motoacholic haha. I sent a few PM's to people about questions and thank you for your guidance.

Here's my build list:

- Suspension Swap - Decided to go with Xr100 forks with BBR springs
- 12 volt conversion with lipo batt.
- All new cables
- Rental or tag med/low bars
- Replace all handle controls
- LED headlight + blinkers
- I already own the taillight - pulled it off my Duc before i sold it
- New speedo - Mine is toasted
- Clutch plates - already installed at this point
- Custom seat + Frame Loop
- Powder coat frame + rims
- Figuring out what to do with motor - might just soda blast - might paint
- New Tires

... and I think thats it.

I have two young, young kids so I tinker on my free time but I will post updates with I can. I also have an instagram for fun just for the build @tv_motobuild



Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Jun 26, 2015, 18:23:26
Here's the CB the day I brought it home. Made a quick work bench as well  ;D

Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Jun 26, 2015, 18:24:48
Opened up the clutch side to find out there was no clutch basket! Good thing I had that spare motor! Cleaned up the missing parts and swapped them out.
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Jun 26, 2015, 18:36:50

So far I have accomplished the following.

1. registered the bike
2. replaced the Carb - old one was junk
3. Put in a whole clutch assembly and oil pump from my other engine.
4. New clutch plates and springs
5. re timed the motor and valve clearence
6. replaced the 6v battery
7. Replace the regular/recificer
8. fired the bike up! It ran, sort of. - Battery is not keeping charge

Currently Replacing the front end with XR100 fork legs, BBR springs, 1980 CB125 Triple tree and allsballs bearings to finish it off.

I also have all the sparts to get started on the 12volt conversion.

Next Parts that I am purchasing:

- Bars
- New Controls
- New cables
- speedo
- Headlight / Bracket
 



Title: Re: 73 CB100 Tracker Build
Post by: WhyNot on Jun 26, 2015, 20:04:45
OK, think I was one of those that pushed you for this thread, from another thread.

Cool looking bike, good ideals, nice upgrades. These little bikes will grow on you, ask me how I know.

Most builds take anywhere from 1 to well over 3 years.

But, really, when you own and work on these vintage masterpieces, builds never end.

Even when it's a full on restoration.

Looking forward to more upgrades and pictures.

BTW, that carb looks like the same one I just got for my little guy.
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Jun 27, 2015, 23:31:23
So ive read on the forums that the 80 cb125 triples will bolt right onto the XR100 forks...seem to be a size difference because they seem to be bigger. any insight from anyone who has done this?
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Jun 28, 2015, 01:15:29
First photo is the 1980 CB125 Triple, the next is the XR100 triple which fits fine in my CB100.

See the gap? Dont get it.
Title: Re: 73 CB100 Tracker Build
Post by: nrcb125 on Jun 28, 2015, 01:30:14
I think you were sent a set of triples from an XL125S. Those have 31mm forks, and my best guess as to the measurement is 1 7/32 inches, which is about 30.956mm. It's an interesting crossroads... to put beefy 31mm forks on or get the proper 27mm forks.

If it were me I'd go for the 31mm forks!

Here's a list of fork tube diameters I've found very useful in my research:
http://www.scandalon.com/2009/06/motorcycle-fork-diameter-chart (http://www.scandalon.com/2009/06/motorcycle-fork-diameter-chart)
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Jun 28, 2015, 02:33:46


True, i just feel at this point I am pretty committed to the XR100 forks. 31mm does sound nice though, I would start to run into a rim issue then at that point no? thanks for the info!
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Jun 28, 2015, 03:13:31
If I ran CB200 Forks, with the 31mm triple what hubs could I get away with to avoid the disk break? Seems like its sort of a head ach to make it hydraulic.  I saw someone somewhere mention a CB175 hub? Could I use my CB100 rim or would it just be wise to run a whole CB175 front rim?

Trying to figure out what I want to do, its either get the right 27mm triple and move forward or try to return everything I have bought and start from scratch with the CB200 fork idea.

While I was waiting on parts today, I was finally able to take the bars and headlight rats nest apart. Labeled up all the connections too.

Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Jul 13, 2015, 15:15:32

I found the correct CB125 triples and i received my bearing kits from All ball racing. I bought a soda blaster from harbor and freight to test it out on my replacement triples since they were a bit dirty.

Going to seat in the bearings soon and make sure the front end all works out.
Title: Re: 73 CB100 Tracker Build
Post by: WhyNot on Jul 13, 2015, 15:22:11
I found the correct CB125 triples and i received my bearing kits from All ball racing. I bought a soda blaster from harbor and freight to test it out on my replacement triples since they were a bit dirty.

Going to seat in the bearings soon and make sure the front end all works out.


So were you pleased by that soda blaster?

Can it shoot other abrasives besides soda?

What soda did you use?

Thanks bro.
Title: Re: 73 CB100 Tracker Build
Post by: Luugo86 on Jul 13, 2015, 16:30:56
Nice build so far man.. I'm definitely in.     I would also like to know about that soda blaster.. how did it work, what did you use for blasting media, and was it reasonably priced? It looks like a decent piece of equipment. Thanks man!
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Jul 13, 2015, 17:19:52

So the biggest catch for the soda blaster is the actual source. I have had a little 2.5 gallon husky compressor for awhile that gets the job done for small stuff but it sucks for anything more. So I basically had to upgrade my compressor in order to use the blaster.  :(

The soda blaster basically needs a constant psi pressure of 90 psi or so. I was looking at a bunch of videos online and heard a few different opinions on it.

Harbor and freight was having a deal on a 20 gallon compressor, which i felt would get the job done.  It was $160 and I wasn't going to drop any more money on a larger compressor that I do not need. Ive been wanting to upgrade anyway. So I would recommend that you really don't want to use anything smaller than a 20 gallon, because mine was on almost the entire time.

The soda blaster worked pretty good, it took the paint away easily. For the rust it took a little more time compared to the paint that literally blew off. I bought the media at harbor and freight in a 50lb bag, it was $39. You can only use soda for this unit and it is pretty easy to clean up. To load the media is a little tedious, i've read that people suggest a funnel but it takes forever. Second time around I just poured it straight from the bag. I just used a oil catcher to grab any of the over flow which really wasn't much.

Make sure you have a air filter on your compressor to catch any additional moisture before it hits the blaster.

It was a good test to see how it worked, I still basically have my entire bike to do in the next run.   


Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Jul 13, 2015, 17:22:47

Oh i paid basically $75 for the blaster. It was on sale at harbor and I used a 20% off coupon.  I bought the warranty too just in case though. I mean for $75, is not a bad price if you dont need a new air compressor like me lol, i was a bit upset about that. It even came with pipe tape, which was surprising.
Title: Re: 73 CB100 Tracker Build
Post by: WhyNot on Jul 13, 2015, 19:57:09
Oh i paid basically $75 for the blaster. It was on sale at harbor and I used a 20% off coupon.  I bought the warranty too just in case though. I mean for $75, is not a bad price if you dont need a new air compressor like me lol, i was a bit upset about that. It even came with pipe tape, which was surprising.


Cool.......thanks....I have a 33 gal compressor, so that ain;t gonna be a problem.
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Jul 13, 2015, 20:36:58
Played with photoshop quickly today to put my ideas and color schemes together. I am thinking about painting the frame a seafoam green like the Paul Smart. I chopped in a few of the mods as well, like the XR forks, new shocks, seat and etc.

Thoughts? Thanks!
Title: Re: 73 CB100 Tracker Build
Post by: 45exmayor on Jul 13, 2015, 22:17:11
A seat like that will work fine.  My friend built a steel pan with a tab that fits in the rear tank rubber.  On the rear it attaches to a bracket he welded across the frame. I spaced up the rear with some alloy spacers from my old monsters exhaust and ¼ I'd grommets from radio shack  it locks on with pins under the bracket
Really like the look of the Smart green frame
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Jul 14, 2015, 14:52:10
awsm, thanks for the feedback! Love the way your seat turned out.
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Jul 14, 2015, 15:07:57
Out with the old and in with the new. Swap out my old bearings with the new bearing kit. It was a pain to hammer the couplers out of the frame stem. I got the new ones in pretty easy, but i feel like they should sit lower in the frame. they are right at the lip, is that right? I will take better pics soon of what it looks like disassembled again.
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Jul 14, 2015, 15:11:29

Has anyone ever bought one of these seats? how was the quality? Originally i wanted to make my own but for such a low price it seems like this might make more sense?

http://www.ebay.com/itm/121676635396?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT (http://www.ebay.com/itm/121676635396?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT)
Title: Re: 73 CB100 Tracker Build
Post by: 45exmayor on Jul 14, 2015, 18:38:10
When I pressed the outer races for my all balls head bearings, the lower on went slightly inside the head tube a little so the dust seal seals against the head tube.  The upper is flush with the head tube.  I took a thin feeler gauge and it would not slip between between the seat in the tube and the race.
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Jul 14, 2015, 18:58:50
Ok thanks, what did you use to seat the lower race?
Title: Re: 73 CB100 Tracker Build
Post by: 45exmayor on Jul 14, 2015, 19:29:37
I used this threaded rod with large washers to pull it flush with the tube and then a socket upside down with a short extension and a dead blow hammer.  I put the frame on some towels turned upside down with the head tube on a wood block padded with a couple of shop towels.  Put some grease on the outside of the race and the inside of the head tube.  Tap it and it will change tone when it bottoms out on the seat.  I like the dead blow hammer because I can hear it bottom out.
Title: Re: 73 CB100 Tracker Build
Post by: Luugo86 on Jul 14, 2015, 22:18:07
Travivisual,
   
      Thanks for all the feedback and information on the soda blaster.. much appreciated.. As far as the seat goes.. You never know what you are going to get with those ebay seats as far as fit and quality goes.. for my last build project I made my seatpan/tailpiece.. and then I made a second fiberglass upholstery pan that I had foamed and leathered.. I can throw some example pics if you want.. it worked well.. i didnt want to trust one of those ebay seats

 -Luugo
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Jul 16, 2015, 13:20:42

Thanks for the tip 45exmayor, that way worked! bearings are sitting nice now.

Luugo86 - Yea  i was just curious, I am still holding off and will probably make my own seat. thanks for the input

Since i have my front end dialed, I moved onto the 12v conversion and ran into a bit of a snag...

I need to keep the seal and cables from my cb100 stator and move it to my replacement cb350 stator.  I saw some people just silicone the wires to the engine where the  seal goes but i dont really want to do that. Can i cut and splice before the seal? will that work with the wire coating?

On another note, i think i need to tear the whole motor down soon too before i finish the build. once i opened it but it had some gray/brown slush in the casting. I cleaned it before I put oil in it in the first place. probably has been broken down since the 70s.

My bike came with the exhaust missing, how is this suppose to mount back here? in the repair manual i cant find anything.


Title: Re: 73 CB100 Tracker Build
Post by: AMD500 on Jul 18, 2015, 09:05:18
 i know im late to the game on this one. but really like the paul smart color scheme.
http://kdicycles.com/ check out this color scheme. little more saturated than the paul smart bikes, but damn it looks hot.
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Aug 13, 2015, 22:37:10

Need some opinions, what do you guys think?

Option 1
http://www.ebay.com/itm/321099898940?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT (http://www.ebay.com/itm/321099898940?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT)

Option 2
http://www.dimecitycycles.com/5-3-4-inch-satin-black-retro-style-halo-headlight-assembly.html (http://www.dimecitycycles.com/5-3-4-inch-satin-black-retro-style-halo-headlight-assembly.html)

Option 3
http://www.dimecitycycles.com/black-and-chrome-7-inch-metric-style-headlight-assembly.html (http://www.dimecitycycles.com/black-and-chrome-7-inch-metric-style-headlight-assembly.html)

Option 4
http://www.dimecitycycles.com/6-1-4-inch-gloss-black-h4-headlight-assembly.html (http://www.dimecitycycles.com/6-1-4-inch-gloss-black-h4-headlight-assembly.html)
Title: Re: 73 CB100 Tracker Build
Post by: 45exmayor on Aug 14, 2015, 08:58:55
The 7 inch one will look to large on the small bike.  Any of the others will look fine, jus depends on what final look you want.  The one with the halo will make the bike look more modern.  Be sure what you get had an H4 bulb mount so you can use a led light if you want.
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Aug 17, 2015, 13:44:51
awesome thanks for the feedback
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Aug 17, 2015, 18:33:05

Looking to run these guys as my signals, besides the relay at the bottom is there anything else that i need?

http://www.dimecitycycles.com/vintage-cafe-racer-caferacer-bobber-brat-chopper-custom-motorcycle-electronic-lighting-parts-mini-black-rectangle-led-turn-signals-blinkers-tl-led047-bk.html

Relay
http://www.dimecitycycles.com/vintage-cafe-racer-caferacer-bobber-brat-chopper-custom-motorcycle-electronic-lighting-parts-universal-dot-approved-flasher-relay-24-0005.html
Title: Re: 73 CB100 Tracker Build
Post by: 45exmayor on Aug 17, 2015, 19:13:02
Depending on how you wire the flashers you may need this diode https://www.superbrightleds.com/search/motorcycle-accessories/diode/. It goes in the wiring from the blinkers to the indicator light on the speedo.  Without the diodes the power will feed backend all four blinkers will flash at once.  If you need it I will postman drawing of the circuit. Also, it might be simpler to wire using a 2 pole relay that just has power in and signal out.  Wiring takes more time than anything else.
Title: Re: 73 CB100 Tracker Build
Post by: 45exmayor on Aug 17, 2015, 19:29:07
I wired mine like this  used triple female terminals for my project. http://www.cycleterminal.com/bullet-terminals.html
Since I was doing a complete rewire I got a crimper. It was slow going but I ended up,with all new terminals and each wiring run is only as long as it needs to be. My here are no splices to fail later
Title: Re: 73 CB100 Tracker Build
Post by: trek97 on Aug 17, 2015, 19:55:25
sparckmoto relay is less than half the price + the turn diode thingy + you will help feed a fellow DTT-ers children at christmas time.


Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Aug 17, 2015, 21:03:48
Perfect, that makes sense. Just saw the "Ignition Coil or Headlight Subharness" on Sparck moto, is that something i should have as well?
Title: Re: 73 CB100 Tracker Build
Post by: trek97 on Aug 17, 2015, 21:42:33
not exactly sure bout the sub harness but you will have to email matt specifically about the turn signal diode.  he dont advertise it on the site.
Title: Re: 73 CB100 Tracker Build
Post by: Roots265 on Sep 08, 2015, 18:13:58
 Hey Bud
great build. im actually building one of these little machines at the moment too. (just started really) see topic http://www.dotheton.com/forum/index.php?topic=65546.0
what coil are you going to run with the 12V system?
im going to run a Oregen Moto battery eliminator and reg/rect. ill see how the standard generator handles this and maybe upgrade later to a ricks high output unit?

cheers
Adam
Title: Re: 73 CB100 Tracker Build
Post by: sleventynineR on Sep 08, 2015, 21:49:11
Cool bike, I got a 70 that's in the works.
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Sep 22, 2015, 18:20:52

Thanks Adam...

I went with a coil from a YAMAHA XT600, it was suggested to me from Sparck Moto. I bought their 12volt reg/rect too. I bought a used cb350 stator and it fit right in, just using the stock plug. That's what i am currently working on now. Looking for lums/wire harness to really move any further.

Not sure if the lil stator can pump enough juice to eliminate battery but i really don't know.

Ill check out your build!

Hey Bud
great build. im actually building one of these little machines at the moment too. (just started really) see topic http://www.dotheton.com/forum/index.php?topic=65546.0
what coil are you going to run with the 12V system?
im going to run a Oregen Moto battery eliminator and reg/rect. ill see how the standard generator handles this and maybe upgrade later to a ricks high output unit?

cheers
Adam
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Oct 07, 2015, 16:49:32
Its been a little bit, but I have some things to report!

Got a bunch new parts it!

Bars
Speedo
New Brake & Clutch Levers
New Handle bar controls
Head light
rear shocks are on the way
And a bunch of electrical stuff for my 12volt conversion

I installed the 350 stator, it was super tricky to get the oil plug to fit on from the original cb100 stator. It makes me feel a lot better about it, i know some people just used some sort of silicon but if i need to open it up for any reason I would like that option. Just need to solder it up to the stock plug.  Been really sitting on electrical to be honest, want everything to be done right.  Finally made an oder to cycle terminal and got what I needed.

Now i just need to wire it all up and make sure she works, then onto the next phase!

Oh! also found a paint chip for the frame, its in one of those photos.

Pulled out my old tail light that I had on my Sport Classic, going to get that re wired as well.

Title: Re: 73 CB100 Tracker Build
Post by: CALfeRacer on Oct 07, 2015, 16:51:45
What did you end up doing with the oil plug to make it work? I'd like to keep it as well
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Oct 07, 2015, 17:54:49

I pulled out the wires from the stock piece. The seal it self is pretty strong, I used a tapper tool to help stretch it out and pulled the new wires from the 350 stator through. Takes a little bit of time, the coating will want to slip off as well, i used needle nose to grab it from the other side.
Title: Re: 73 CB100 Tracker Build
Post by: CALfeRacer on Oct 07, 2015, 17:56:00
Cool. Assuming you just the connector off and did this before putting a new one on?
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Oct 07, 2015, 18:13:26

Correct, just gave myself enough leads to splice on later and then pulled them out. Put the tapper in the exist holes and slow worked in the new wire. Careful to not break it though obviously.
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Jun 21, 2017, 18:23:49
Long time with no update  :-[ But I am looking to finish this thing in the next month or two. Or so i think...

Anyways, finally got my seat loop made and welded on. I also fabricated a battery pan. Its ready to be soda blasted and painted this weekend.  I decided to scrap the turquoise and I am going to paint it the Toyota "quick sand" color. Pretty excited since this is really whats been holding me back. Everything is apart and ready to go. I will post some more pics after this weekend.
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Aug 28, 2017, 23:22:05
(https://uploads.tapatalk-cdn.com/20170829/e3ececb5566aa8343ebb70ea6ab77617.jpg)(https://uploads.tapatalk-cdn.com/20170829/bd46e3d78e1dff790d797052231c93dc.jpg)(https://uploads.tapatalk-cdn.com/20170829/01c2c6083dea273136a3277ddbc59d0e.jpg)(https://uploads.tapatalk-cdn.com/20170829/9c148f94c70c393fc2450728d981356b.jpg)(https://uploads.tapatalk-cdn.com/20170829/00cb8f1287f7265aed28034edc2b3fb4.jpg)(https://uploads.tapatalk-cdn.com/20170829/81ff31cf58706c9c686b78da359120a4.jpg)(https://uploads.tapatalk-cdn.com/20170829/f615857e808bc528c61252c668af29ce.jpg)(https://uploads.tapatalk-cdn.com/20170829/6db8fb01765ee61fd9d08351fab429ee.jpg)

It's been a little bit but I got everything painted. It was a little more work than anticipated but I learned a lot through the process. Pretty happen with how it turned out.

Over the last few days I got the bike to a roller, really starting to come together, now it's just getting everything back on the bike and electrical.

What do you guys think?


Sent from my iPhone using DO THE TON (http://r.tapatalk.com/byo?rid=89466)
Title: Re: 73 CB100 Tracker Build
Post by: WhyNot on Aug 29, 2017, 06:38:15
Looks good, very detailed oriented....me......i just slap them together and let 'em rip, tater chip......
Title: Re: 73 CB100 Tracker Build
Post by: trek97 on Aug 29, 2017, 08:07:29
Super nice.   8)

But those rear shocks are gonna make it ride like a hardtail.   :o  They are for something like a gold wing.
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Sep 06, 2017, 17:40:29
Thanks! Pretty stoked.

The shocks feel good, not too stiff. Way better than stock and I am a bit bigger anyways.


Sent from my iPhone using DO THE TON
Title: Re: 73 CB100 Tracker Build
Post by: trek97 on Sep 06, 2017, 20:07:49
Thanks! Pretty stoked.

The shocks feel good, not too stiff. Way better than stock and I am a bit bigger anyways.

(http://www.dotheton.com/gallery/11494-200816163635.png)
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Sep 26, 2017, 12:38:33
(https://uploads.tapatalk-cdn.com/20170926/2716a1182e20a2dc3a9526840d5908db.jpg)

(https://uploads.tapatalk-cdn.com/20170926/28de3596eba10cd1cda7fd8268ef7c8f.jpg)

(https://uploads.tapatalk-cdn.com/20170926/40f67f15da5411caf73e7d271e62ba54.jpg)

(https://uploads.tapatalk-cdn.com/20170926/69d8935cea300867e8a11107ec1c425a.jpg)

Finished painting the motor, just popped it back in. Almost there.


Sent from my iPhone using DO THE TON (http://r.tapatalk.com/byo?rid=89466)
Title: Re: 73 CB100 Tracker Build
Post by: coyote13 on Sep 26, 2017, 13:25:14
Looking good.  REAL good!
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Oct 03, 2017, 17:51:31
(https://uploads.tapatalk-cdn.com/20171003/277060eb9758e8b199f69cbf4c3e6cc7.jpg)

(https://uploads.tapatalk-cdn.com/20171003/71a988a2206ea380fc1b94e9a8593535.jpg)

Worked on the seat pan this past weekend. Bought material to try and attempt to make my own seat and cover as well.

Plugged in my power last night and everything worked! Well almost everything, need to check the wires on my tail light.


Sent from my iPhone using DO THE TON (http://r.tapatalk.com/byo?rid=89466)
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Nov 06, 2017, 18:35:34

Does anyone know what is going on in the video below? Finally got the bike running but ran into two issues and in the below video being one of them. It seems like either oil or gas is coming out of the lower cylinder. I have been told its a blown head gasket, but its just a guess. Has anyone run into this before?

https://drive.google.com/open?id=17DmXBFbi4i8YqErsZlTFDKqRP88zEgaK (https://drive.google.com/open?id=17DmXBFbi4i8YqErsZlTFDKqRP88zEgaK)
Title: Re: 73 CB100 Tracker Build
Post by: Pete12 on Nov 07, 2017, 04:11:50
You've blown the base gasket, which is quite unusual on a four stroke. The first thing you should check Is the crankcase breather to make sure it's not blocked. Did you rebuild the engine?
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Nov 07, 2017, 12:55:22
Not a full rebuild, but I had a thicker breather tube on the crankcase breaker. Maybe it wasn't getting enough air?


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Title: Re: 73 CB100 Tracker Build
Post by: Pete12 on Nov 07, 2017, 16:59:43
If your breather is clear then check the oil level and make sure it's not too high. If it is high and it wasn't before you started then it may be a mixture of fuel and oil which can be a result of the carb flooding and filling the cylinder with fuel if the inlet valve happens to be open at the time (this all happens while the bike is stopped).
If the oil level is OK then it's likely the piston rings not doing their job.
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Nov 08, 2017, 12:17:17
Thats good to know. Unfortunately, i already drained the oil to start the process to pull the motor out and apart to check the cylinder. I guess I will check this first and go from there. thanks for the help.
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Feb 07, 2018, 13:34:34
Update

I rebuilt the top end due to a crack in the bottom cylinder which I replaced. I have the bike running now, I cant seem to get the bike run and idle properly though. I have rebuilt the carb and cleaned it a few times now and even bought carb rebuild kit.  I got it to a point this past weekend where it would run with out the choke out which took a bit of tweaking with the carb.  I have ridden it down the street and it sounds like its choking and not getting enough fuel. There is fuel in the line, I have adjusted the throttle pin to run more rich. I order a few different size main jets to test, but I am running out of knowledge, skill and ideas.

Any input would be appreciated. Thanks
Title: Re: 73 CB100 Tracker Build
Post by: coyote13 on Feb 07, 2018, 13:44:49
You need to get more intake length between the carb and the filter, the lowly CB100 does not respond well to intake and exhaust changes.  If you can find a silicone elbow or something like that you may have an easier time tuning, otherwise I think you'll be chasing your tail.

Also may see if you can find a better quality filter, I think I know the one you have on there currently...
Title: Re: 73 CB100 Tracker Build
Post by: coyote13 on Feb 07, 2018, 13:46:48
Also check to make sure the exhaust isn't plugged up at all.  I was just looking at mine the other day and the stocker I had hanging from the rafters of my garage had become home to a number of wasp nests.  Can't imagine that would be helping the exit flow of hot gas very well!
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Feb 07, 2018, 16:06:31

I was thinking about that, but it sounds like the bike isnt getting enough gas.

I tossed that filter out and got a UMI Filter, I have read on another build that it seemed to help. The other build also had an elbow as well which I think I will try.

I feel that the bike should still run better than it current does even with air box issue.

Thanks for the input.
Title: Re: 73 CB100 Tracker Build
Post by: coyote13 on Feb 07, 2018, 16:19:04
If I was betting it's an airflow issue, which essentially means you're not getting enough fuel.  Since the intake is starving the carburetor it isn't able to push as much air/fuel into the combustion chamber.  I don't really think you can jet your way around that, if it is indeed an intake issue.
Title: Re: 73 CB100 Tracker Build
Post by: BwStew on Feb 28, 2018, 00:37:27
Love this build! Have a 1972 model I saved from a barn where it has been setting since the late 70's.  Going to fix it up with my son and he can ride it to school! Awesome build!
Title: Re: 73 CB100 Tracker Build
Post by: Luugo86 on Feb 28, 2018, 18:31:49
Clean little build man. Do you have any photos of how you fabricated the electronics tray and how it is mounted?
Title: Re: 73 CB100 Tracker Build
Post by: coyote13 on Mar 01, 2018, 16:28:45
Right, so thinking about your issue a little more.  Have you actually measured the jets you ordered?  There's apparently quite a lot of variance between different mfgs and even though the little buggers are stamped with the right number, they may not be correct.  A drill bit would probably suffice to compare how close your stock jets are to the new ones.

May also want to check that you have a good seal between your carb and boot, and the boot and head.  Get her running and spray a little WD-40 around the boot, if there's a leak it should be pretty obvious as your RPM's will increase fairly immediately.  A vacuum leak could lead to the problems you're describing as well.
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Mar 21, 2018, 19:24:52
BwStew - Thanks man, these are fun a build cant wait to finally tweak the settings and get her finished.

Luugo86 - Appreciate it. I can take some photos of the tray. I just cut cardboard pieces and tapped them together to get the fit and the I actually decided to weld the box into the frame. Much cleaner on the outside than the inside.

Coyote13 - Thanks for the brain storming, its much appreciated. I have been talking with some friends who have mentioned the same thing. Haven't had a chance to bring it back down and try that. Seems to make sense. I saw on 45exmayer's thread that he added a little hose to create a longer separated airflow. I ordered a 38mm intake turbo hose to try and make something similar. I will test all of this and report back. I havent even opened up the new jets, Ill try one thing at a time.

Update - As I am waiting to finish tweaking the settings on the bike, I sent my seat to the upholstery shop. I should hopefully have it back this week. I stripped the tank paint and decided to go with a brushed look and clear it. Not too bad, in the home stretch now.



Title: Re: 73 CB100 Tracker Build
Post by: trek97 on Mar 21, 2018, 21:45:29
WOW bud, she's really looking good.   8)
Title: Re: 73 CB100 Tracker Build
Post by: WhyNot on Mar 22, 2018, 06:47:46
Sure does look good.

Did you document the tank work?
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Apr 05, 2018, 12:57:06

I didn't document the tank work, I did a little bit on my instagram story but didn't end up saving it which is a bit of a bummer when looking back. Been trying to just get the bike wrapped up.

I switched up the air filter again, think it will help. Havent had a chance to fire it up again to check but I will in a week or so. I will post pictures soon.

I did get my seat done, or almost... went to pick it up and found the upholster messed up the rear pattern. Its suppose to be vertical with all color instead of just the blue, he is going to have another go at it. You can see the original material below the seat for reference.

Thoughts?
Title: Re: 73 CB100 Tracker Build
Post by: advCo on Apr 05, 2018, 13:01:19
Seat looks badass to me.
Title: Re: 73 CB100 Tracker Build
Post by: coyote13 on Apr 05, 2018, 13:19:16
Looks good but if it isn't what you wanted...
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Apr 05, 2018, 13:54:11
Thanks for the feedback! I figured that I have been working on this thing for almost three years now, might as well get the seat the way I want it. Pretty happy with the seat overall though. Cant wait to see it on the bike.
Title: Re: 73 CB100 Tracker Build
Post by: braaap! on Apr 05, 2018, 14:16:20
Amazing work!
Title: Re: 73 CB100 Tracker Build
Post by: trek97 on Apr 05, 2018, 14:48:13
Thanks for the feedback! I figured that I have been working on this thing for almost three years now, might as well get the seat the way I want it. Pretty happy with the seat overall though. Cant wait to see it on the bike.

Dude the build is looking great.  I like the seat as is and I think you’re right about the pattern change to show more colors. 
I really got to hand it to you.  Because, I got keep things moving to maintain my level of interest in a project.  3 years I would’ve had that thing buried under a pile of the other unfinished and forgotten projects.  Good job keeping w it and keeping up the good work.  Excited to see the finish.
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Apr 05, 2018, 16:13:41

Thanks, I appreciate it! Hoping to finally ride this thing more than just down the street soon. I had my first kid not too long after i started and time just slips away faster than you think. Plus my wife wont let me get a new project until i finish this one haha...
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Apr 13, 2018, 12:47:30

Here is some photos of my air filter extension, hoping this will help a bit. From what I have seen/read it should help. Seat should be done in the next few days...
Title: Re: 73 CB100 Tracker Build
Post by: trek97 on Apr 13, 2018, 19:37:43
I had my first kid not too long after i started and time just slips away faster than you think.

Feels like my daughter was 9yo just yesterday....now she is married.
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Apr 24, 2018, 12:54:20
Had a mechanic come over the other day to help me get the last few bugs out.... Here is what he came up with..

Points were old, replace - Easy
Original carb had a throttle jet logged/stuck/broken off inside - replace - sucks trying to find a decent one
Timing chain, too loud / old / stretched - Replace - This sucks since I have to re open the motor again

We did get the motor running decently well but not good enough, a bit bummed.
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Apr 25, 2018, 12:47:21

Even though I still dont have a running bike....the seat is done! Pretty pumped on how it turned out.
Title: Re: 73 CB100 Tracker Build
Post by: Maritime on Apr 25, 2018, 12:48:13
It was good before but that is better.  I like it.
Title: Re: 73 CB100 Tracker Build
Post by: Luugo86 on Apr 25, 2018, 13:29:30
Dude that seat is fucking killer man.. did you do that yourself or have a guy do it? I rly dig it
Title: Re: 73 CB100 Tracker Build
Post by: Tim on Apr 25, 2018, 13:29:36
Much improved.
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Apr 25, 2018, 13:37:20
Thanks! I am pretty happy with the way it came out.

I made the seat pan and had a bad sort of rough foam layout, and I also supplied all the material to a local upholster and he did a great job.
Title: Re: 73 CB100 Tracker Build
Post by: cbrianroll on Apr 25, 2018, 18:25:03
That seat came out great, I have an old poncho I've been thinking of trying to incorporate into a seat....hadnt worked out though.
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Jul 31, 2018, 14:49:31
Been a little while since my last update but I think its about finished.

I had to recently replace the points, replace cam chain since I could hear it, swap out the carb again and lined the fuel tank. Took a bit of time getting the timing right but when I did it fired right up!

Was able to ride it for a few miles the other night and it runs really strong, idles great and rides pretty good.

I will try and post some "final" photos here soon.
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Aug 03, 2018, 19:13:17
Here she is.
Title: Re: 73 CB100 Tracker Build
Post by: trek97 on Aug 03, 2018, 21:26:13
She's a real sweetheart bud.    :)

I like the forks, How did you address the front hub (brake) stay?

You may be better off w carb tune, running a uni-filter or k&N. 

And you could probably lose the unsightly tape wrapping on filter too, as she's way to nice for that.   8)

Title: Re: 73 CB100 Tracker Build
Post by: Rimmy on Aug 03, 2018, 21:58:26
That's a nice looking ride man!
Title: Re: 73 CB100 Tracker Build
Post by: WhyNot on Aug 04, 2018, 08:17:49
Love it.......looks great.

Wish I could get mine going.
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Aug 06, 2018, 18:37:48
She's a real sweetheart bud.    :)

I like the forks, How did you address the front hub (brake) stay? Thanks, I just the stay on the forks, worked just like stock.

You may be better off w carb tune, running a uni-filter or k&N.   I think I am going to take the tape off, seems like she is choking a little bit, I have a uni-filter too but it actually did not run as well compared to the pod.  ???

And you could probably lose the unsightly tape wrapping on filter too, as she's way to nice for that.   8)
Title: Re: 73 CB100 Tracker Build
Post by: travisvisual on Aug 14, 2018, 13:49:36
Not sure why, but I think my left side case cover is leaking oil. Going to try Hondabond, anyone have any experience with that?
Title: 73 CB100 Tracker Build
Post by: travisvisual on Dec 07, 2018, 01:32:07
Went to the desert and had a buddy help me out with a few photos.




Sent from my iPhone using DO THE TON (http://r.tapatalk.com/byo?rid=89466)
Title: Re: 73 CB100 Tracker Build
Post by: pidjones on Dec 07, 2018, 07:08:09
Saddle blanket insert is a nice touch. Any significance to it?
Title: Re: 73 CB100 Tracker Build
Post by: WhyNot on Dec 07, 2018, 07:38:36
Really is a good looker....................

I like it........think I said that b4......
Title: Re: 73 CB100 Tracker Build
Post by: advCo on Dec 07, 2018, 09:09:55
Looks great. As for the Hondabond, yes. It works well if you can put a very thin coat on your side cover, let it cure for a bit and then reinstall cover with gasket.