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How do I check the compression of my stihl km90 engine

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Remove the spark plug, spin the compression tester into the spark plug hole, hold the throttle wide open and pull the cord 2 or 3 times. Look at the reading and compare it to specifications... Your lawn and garden store may be able to do it for you or may know someone who can. Hope this helps.

Posted on May 12, 2017

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Pull the spark plug out and hook up a compression test meter.

Posted on May 12, 2017

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