October 29, 201213 yr I have a 250 evo 2009 and it will only run with the airscrew fully closed I was windering if any one had any ideas what's wrong
October 29, 201213 yr Sounds like it could be sucking air from somewhere,check carb to barrel rubber for cracks or main bearing seals.
October 30, 201213 yr You don't say whether you have bumped up the idle which is a common way to deal with a misbehaving pilot circuit. This sort of bypasses the idle circuit, or maybe overrides it would be more accurate. One of the characteristics of the Keihin is the very small exit hole for the pilot circuit behind the slide. I have had the hole blocked by a bubble of water after riding in wet conditions and the only way to clear it was with a disassemble of the carb and a blast of compressed air. My suggestion would be to drop the carb and do a disassemble and clean. With compressed air and paying attention to blowing through the air passages in the carb body. I think that will fix your problem.
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