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01 YZ250 engine rev

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When i let the bike idle for a short time the engine starts to rev for a short time then goes back to a normal idle i have replaced the intake boot and throttle cable and i sprayed carb cleaner on the new boot and the air box where it connects to the carb and it didn't rev so i don't know why it does it can some one help me.

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I put brand new boot and reeds and gaskets on my 2002 250. Still had a leak and carb cleaner didn't find it. Had to build a pressure tester to find it with soapy water. Boot was leaking at read block. Sealed it with permatex. Pretty common.

Mine had a wondering idle with the leak. No more leak no more wondering idle.

-E

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