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compression check

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Does anyone know the thread of the spark plug hole in the head. So I can get the proper compression check fitting. Is it 14mm? Also I have never done a compression check so can someone give me instructions on how to do it.

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I mostly do comp checks on 2-strokes, but should be same principle:

Screw your gauge into the plug hole. Open throttle fully. Crank motor until gauge stops increasing (usually takes several spins of the motor).

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How would you get the exhaust valve to close on a 03 and newer model???

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