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Author Topic: 73 CB100 Tracker Build  (Read 6979 times)

Offline travisvisual

  • Posts: 48
73 CB100 Tracker Build
« 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




Offline travisvisual

  • Posts: 48
Re: 73 CB100 Tracker Build
« Reply #1 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


Offline travisvisual

  • Posts: 48
Re: 73 CB100 Tracker Build
« Reply #2 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.

Offline travisvisual

  • Posts: 48
Re: 73 CB100 Tracker Build
« Reply #3 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
 




Offline WhyNot

  • DTT SUPPORTER
  • *
  • Posts: 979
  • ~~~If it ain't raining, I'm riding~~{iii}?~~prost~
Re: 73 CB100 Tracker Build
« Reply #4 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.
2006 Harley Davidson Heritage Softail
1975 Honda CB750K5 needs carb work
1974 Honda CB350F2 needs tins painted (being lazy)
1972 Honda CB175K2 roller no engine
1972 Honda CB/CL350 Engines need roller
1972 Honda CB100K2 needs kicker shaft
1990 Mitsubishi MM needs engine rebuild

Offline travisvisual

  • Posts: 48
Re: 73 CB100 Tracker Build
« Reply #5 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?

Offline travisvisual

  • Posts: 48
Re: 73 CB100 Tracker Build
« Reply #6 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.

Offline nrcb125

  • Posts: 280
Re: 73 CB100 Tracker Build
« Reply #7 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
« Last Edit: Jun 28, 2015, 01:32:27 by nrcb125 »
'73 CB125S - current project
'99 EX500 - Race Bike


CB125S build thread (haven't updated in 5ever): http://www.dotheton.com/forum/index.php?topic=43403

Offline travisvisual

  • Posts: 48
Re: 73 CB100 Tracker Build
« Reply #8 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!

Offline travisvisual

  • Posts: 48
Re: 73 CB100 Tracker Build
« Reply #9 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.