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Hello , need some help please. I have a 2003 yamaha 650 v star with stock breather and open exhaust, no baffles. I have 8 different size main jets. I have used each size starting with the smallest then up. With the 86 which is the smallest is the best I can get it to run. It idles wonderful. When accelerating anything past an 1/8" turn or less it lags has no power. When it get to close to Max Accel. It tries to begin to preform with a terrible miss . Help please . I am a mechanic and it has got me about to go insane
 
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