I just rebuilt the engine, bored .40 over, new Boysen pro reeds, and a eBay carb kit, fmf fatty gold series and fmf powercore. Choke kills the bike, idle screw is all the way in to make it idle, fuel air is about 1 1/2 turns out, needle on second clip. No bottom end just half throttle or more to make her wheelie. Also running 32:1 91 octane Motul Premix.
Another question I replaced my kill switch and light switch because the old one didn’t work and the new one doesn’t work either. Any help bad CDI?
Whatever stock carb is and jets air box does have a lid on it I had it off when I didn’t have my shrouds on what do you recommend, I’m thinking pilot jet needs to go smaller to give it more rpm and torque at bottom.
I need an actual number off the carb and jets. You can’t guess at this. Assuming you have a stock carb and jets is ok until you find they aren’t. Leave lid on and run a well oiled uni filter.
Try 2 turns out on air screw. All things being equal, other than 2 turns out that carb is jetted spot on. What kind of jets came in the carb kit? Were they genuine Keihin jets with numbers in the side? Sometimes the knockoffs have different orifices than the genuine jet.
2 turns runs like crap, numbers on the top of the jets, where should the needle clip be mines at 2. Also does solve my idle issue and choke killing the engine.
Needle clip should be 2 from the top. Do you have any air leaks around the carb? Have you performed a pressure test? If those two things check out then it could be electrical.
85 ATC250R Need Jetting Help!
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