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05 yz 250 just bought, rough running.

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Starts right away, idles perfectly, when you start on the throttle from 1/4 to 1/2 it bogs terribly after 1/2 to Wide Open runs perfectly. New spark plug currently repacking the muffler where do I go to next? thank you

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As doc says probably something blocking pilot jet. Id start with draining gas from tank take it off ,take petcock off and carb. Clean all that and start over 👍👍 then it won't happen again 

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