Well in my opinion your on borrowed time. In lawn mowers I see them all of the time with 500-600 and they have broken rings an are burning oil. They are NOT a heavy duty motor anymore. The Kohler quality went out the window 30 years ago when they went away from the single cylinder air cooled motors. None of the ones since have lasted like they did.
I would tear it completely down and see what is wrong. I would bet that you have a piston ring on the one side that is either weak or broken. You maybe can get away with de-glazing the cylinder and re-ringing the motor. You can easily have $500 in just doing that but it would be cheaper than replacing it at $2K.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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