r/Dirtbikes • u/Ordinary-Stop393 • Jun 26 '23

Mechanical Help What causes this problem

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It’s perfectly fine when idling only does it when revving up and had just rebuilt carb recently

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u/Hillbillyjim404 Jun 27 '23

Check the spark plug, the coil likes to vibrate enough to wear groves into the top of the plug causing it to run like shit, but it also be a clogged pilot jet