yz250 motor breaking up??????

Joined
Dec 16, 2002
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#1
at the practice track yesterday . i was opening 'er up on a long straight....in 5th gear,pretty much wide open.....then the motor started to break-up or "miss"....would that be the rev limiter? or a possible jetting problem? it would pull almost all the way through 5th, then start to do it, any suggestions? bike ran perfectly thru other gears and all other track situations, which leads me to think it's the limiter....u???(2001 yz250)