73 CB100 Tracker Build

travisvisual

Active Member
DTT BOTM WINNER
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
 

travisvisual

Active Member
DTT BOTM WINNER
Here's the CB the day I brought it home. Made a quick work bench as well ;D
 

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travisvisual

Active Member
DTT BOTM WINNER
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.
 

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travisvisual

Active Member
DTT BOTM WINNER
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
 

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whynot

~~~If it ain't raining, I'm riding~~{iii}?~~prost~
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.
 

travisvisual

Active Member
DTT BOTM WINNER
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?
 

travisvisual

Active Member
DTT BOTM WINNER
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.
 

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nrcb125

Been Around the Block
Re: 73 CB100 Tracker Build

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
 

travisvisual

Active Member
DTT BOTM WINNER
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!
 

travisvisual

Active Member
DTT BOTM WINNER
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.
 

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travisvisual

Active Member
DTT BOTM WINNER
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.
 

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whynot

~~~If it ain't raining, I'm riding~~{iii}?~~prost~
travisvisual said:
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.
 

Luugo86

'73 CB350, '78 XS650 Cafe Killer
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!
 

travisvisual

Active Member
DTT BOTM WINNER
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.
 

travisvisual

Active Member
DTT BOTM WINNER
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.
 

whynot

~~~If it ain't raining, I'm riding~~{iii}?~~prost~
travisvisual said:
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.
 

travisvisual

Active Member
DTT BOTM WINNER
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!
 

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45exmayor

Been Around the Block
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
 

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travisvisual

Active Member
DTT BOTM WINNER
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.
 

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