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Spark Plug Problem

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My spark plug has rattled/unscrewed itself out of my bike twice now. It stays connected to the spark plug boot, but comes out of the head. The plug looks fine, and I'm just wondering what could be causing this and how to fix it. thanks in advance.

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You're either running the wrong plug/thread size, or the threads in the head are about stripped out. The crush washer on the plug is probably shot too.

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Or shop around for a new head, you can find them pretty cheap for a 2 stroke.

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