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Author Topic: 73 CB100 Tracker Build  (Read 12553 times)

Offline coyote13

  • Posts: 1197
Re: 73 CB100 Tracker Build
« Reply #60 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!
Half the fun's in the get there...

Offline travisvisual

  • Posts: 69
Re: 73 CB100 Tracker Build
« Reply #61 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.

Offline coyote13

  • Posts: 1197
Re: 73 CB100 Tracker Build
« Reply #62 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.
Half the fun's in the get there...

Offline BwStew

  • Posts: 1
Re: 73 CB100 Tracker Build
« Reply #63 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!

Offline Luugo86

  • Posts: 707
  • '73 CB350, '78 XS650 Cafe Killer
    • ToadStool Cycle Co.
Re: 73 CB100 Tracker Build
« Reply #64 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?
Live to Die, Die to Live

Offline coyote13

  • Posts: 1197
Re: 73 CB100 Tracker Build
« Reply #65 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.
Half the fun's in the get there...

Offline travisvisual

  • Posts: 69
Re: 73 CB100 Tracker Build
« Reply #66 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.




Offline trek97

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Re: 73 CB100 Tracker Build
« Reply #67 on: Mar 21, 2018, 21:45:29 »
WOW bud, she's really looking good.   8)

Offline WhyNot

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  • Posts: 1180
  • ~~~If it ain't raining, I'm riding~~{iii}?~~prost~
Re: 73 CB100 Tracker Build
« Reply #68 on: Mar 22, 2018, 06:47:46 »
Sure does look good.

Did you document the tank work?
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 SL350K2 Frame for above engine
1972 Honda CB100K2 needs kicker shaft
1990 Mitsubishi MM needs engine rebuild
1984 Dodge D50 Beater DD since 1997

Offline travisvisual

  • Posts: 69
Re: 73 CB100 Tracker Build
« Reply #69 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?