05 yz 250 just bought, rough running.

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

Check pilot system to be clean, clean carb, set float, should be good. 

Thank you

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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