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Is a compression tester really neccessary? Ifso what mm threads for most small engine needs?

its a good diagnostic tool for pointing u in a direction

It is a good diagnostic tester in some cases. 98% of spark plug threads are 14 mm by 1.25 same as your vehicle. Some of the newer chainsaw and trimmers use a 10 mm. ATV's can be 10, 12, 14 mm. Some of the real old equipment engines were 18 mm.

Thanks that helps David