[trykemike]

Thanks for the how-to .

I am familiar with rebuilding carbs but the older styles do not have a diaphram .

the carb on my honda 200cc has both an idle screw and a mixture screw. turning the mixture screw out richens the mix .

what is the equilvalent screw for the gz250 carb ?

I wonder if adjusting mixture is the 1 st modification that should be made.

I have in the past used a larger main jet with mixture adjustments to compensate for unrestrited air flow and less restricted exhaust on a honda with noticeable performance improvement.

Re: exhaust : less restrictive exhaust also has less back pressure which may result in shortened valve life or burned piston crowns. ( did that in the past )