Quote:
Originally Posted by b44
So ive finally completed rebuild, bike runs sweet, idles fine, starts fine,
Just a few issues
Its got a flat spot around midrange,
I have to get a huge run up to get up moderate incline
Ill start playing with carb settings
Try gearing it down
Weight reduction etc
I wasn't expecting xr250 performance but i also wasn't expecting to be that gutless,
Any help appreciated
Zs169fmm
Keihin pz27 carb
Frame/ unknown
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Mid range flat spot is a needle adjustment problem. But first, are you sure you have the right main jet in there? I don't mean right according to the factory setting, I mean right according to your engine/exhaust set up. Also it takes about 500 miles to get the new engine parts bedded in. The easy way to check the main jet is to run it for a mile or so wide open. Then choke it a little. If it surges for a second, main jet too lean. If it falls off immedietly - too rich. Main jet performance is from 3/4 throttle to wide open. Needle jet is from 1/4 to 3/4
