I have a 2005 crf250r with full yoshimira exhaust and stage 2 hotcam runs great on bottom end and cuts out on top end need help I'm pretty sure it's the jetting I put a 175 main in but didn't really do much

Maybe you are hitting the rev limiter?


That symptom is not a 'lean main jet' symptom ,but more like an igintion problem 


Check you plug, plug wire, coil ground.

Ok I'll let you know and it also backfires sometimes

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