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Can someone answer a question about the Kohler compression release? (I have a K301, if that matters.)

I understand how the cam opens the exhaust valve slightly, but what activates the mechanism - how does it engage when starting, but not engage while running?
 

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It's a little flapper on the side of the cam gear ; The flapper spins out at a preset RPM and does not raise the to it's normal height. That is why when checking compression on that engine it must be turned BACKWORDS; As far as the compression release They are for the most part trouble free, and require no maintenance.. Welcome to the forum.
 
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