TB108, race head, 20mm carb. Initial jetting

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TB108, race head, 20mm carb. Initial jetting

This is a discussion on TB108, race head, 20mm carb. Initial jetting within the Z50, CT70 and JDM Monkeybikes forums, part of the General Talk category; Currently waiting on a few more odds and ends to finish this off but as the title says, I'll be running a TB 108cc stroker, ...

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Thread: TB108, race head, 20mm carb. Initial jetting

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    TB108, race head, 20mm carb. Initial jetting

    Currently waiting on a few more odds and ends to finish this off but as the title says, I'll be running a TB 108cc stroker, and race head with the 20mm carb.

    My currently jetting for 88cc was 90/35, with the clip on the second to bottom slot and the bike ran great. I am basically at sea level. Where do I go from here to start?
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    TB108, race head, 20mm carb. Initial jetting

    While I'm talking TB kits and this carb, can anyone give me a good reasons why this goofy extension piece is built into the carb spacer? If it was directly under the floats bowl of even the intake manifold I'd get it but as it sits, it just doesn't seem to warrant a use. Would love to hack it off.


    If you flip it the other way, it fouls on the bowl. It you trim it back slightly, it could work but would do anything at all??? It would be more under the intake but still
    Last edited by 66Cooper; 04-03-2017 at 09:31 PM.
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    Feel free to trim it down, I've done it before in the past. Two cuts with a hacksaw, and a little file work to dress up the rough edges works every time..
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    You may have to go up to a #92 or #95 main and possibly a #38 or #40 pilot jet with the stroker. You should be okay with the clip in the 4th slot from the top of the needle.
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    Just dug through my stock and I have a 92 and 95 main but no spare pilots...of course
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    Here you go...
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    Yep, I was already on trail bikes site. Haha
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    let me know ur final jetting results! im going from an 88 to 108 also!

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    That goofy extension should act as a heat shield to the float bowl.
    (With a kitaco pc20 intake kit you have to trim that tab a few millimeter as well, otherwise the carb wil not mount flush to the manifold.)
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    What are suggestion at altitude? I'm thinking about buying a 108 and I'm having trouble just getting stock motors/carbs tuned right. Sea level was so nice, I didn't appreciate it enough while I was there. Now I'm 6,000ft out my front door with a lot of trails going up to 10,000ft. Maybe I should go with a flex jet?
    Last edited by TankTheory; 04-04-2017 at 08:43 AM.

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    Quote Originally Posted by nielspbr View Post
    That goofy extension should act as a heat shield to the float bowl.
    (With a kitaco pc20 intake kit you have to trim that tab a few millimeter as well, otherwise the carb wil not mount flush to the manifold.)
    I understand you need the spacer portion of it but the "heat shield" doesn't actually shield anything. The carb sits the left and the shield to the right.

    I am thinking two options here:
    1: Cut the shield completely off of spacer
    2: Flip so shield is under intake and trim so it fits.

    Both easy enough but if it seriously does nothing, I'd prefer to just lop it off.
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    I think it's unnecessary. I think a heat insulator is unnecessary between the intake and head. Better between the intake and carb. Never had a too hot intake.
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    Quote Originally Posted by kirrbby View Post
    I think it's unnecessary. I think a heat insulator is unnecessary between the intake and head. Better between the intake and carb. Never had a too hot intake.
    With the kitaco pc20 kit you need the spacer to keep the carb from touching the fins.
    (I do not know the spacing with the tb manifold)

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    With the TB kit, the carb bowl does not hit the fins if spacer is removed but it's really close. Regardless of what I do, I'll keep the spacer. Will probably just cut off the heat shield thing.

    Talked to Trail Bikes and they said a 38 pilot should do it. I guess we will see when it all comes together.
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    Quote Originally Posted by nielspbr View Post
    With the kitaco pc20 kit you need the spacer to keep the carb from touching the fins.
    (I do not know the spacing with the tb manifold)
    It's the same situation with the TB manifold and carb, the bowl drain spigot will hit the fins without the spacer in place, and if you flip the spacer over to the left side, the spigot breaks the spacer when you tighten down the manifold bolts. Been there, done that... only once
    - dirtbkr188 -



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