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Bill, I may be wrong, but I think the engine has to be turning for the ACR to work, so a COMPRESSION test would not reveal anything, but I know that when I adjust the valves on my M18 I can certainly get them both to seal. But then, I don't think the M18 has ACR, either, and I've never adjusted the valves on the K301AQS or K321 which I think do have the ACR. The Kohler manual tells me there is an adjusting screw for the 10 through 16 UP engines. Anyway, I think you can do a leak-down test, but not a compression test on your motor.

 

If you think it is the rings, though, you might as well take them out and look at them, it sounds as if you're already there, anyway. 

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