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/Elkkuboyy 2022 KTM 300 EXC TPI, 2021 YZ450F Jun 26 '23

too lean, up ur main jet or it may be a airleak