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Crf250r

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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

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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.

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