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**Always follow the instructions in your repair manual when doing repair or maintenance work on Outdoor Power Equipment. Manuals can be found at the manufacturers website.**

In this video I check the compression on a Honda GX31 engine with the throttle wide open, and once with the throttle closed. I do this to show the extreme readings you can get when the throttle is not in the correct position during the compression test. The throttle in a gas engine should always be wide open position during a compression test.

Thank you for watching!

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