98% of all carburetor problems are electric. First thing, check for spark.
You are going to get a low compression reading because the Kohler motors have a compression relief system built in, otherwise the S/G wouldn't turn the motor over fast enough to get it started.
Don't get me wrong, yes you probably should clean out the fuel system, but the first thing I always do is check for spark. Then work backward from there.
And yes, the carbon should be cleaned out of the combustion chamber at least every couple of years (depending on use) but that probably isn't going to keep the motor from starting right now.
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