I have a KT19 on another brand of machine that was a smoker when I got it... 1750 hours showing.... I found a brand new OEM Kohler breather and replaced the leaky seals and that so far seems to have done the trick... have not messed with that machine lately as I have to pull the motor and swap the starter (again) so I can again run it. I'd try that since you are 600 hours less, and see what happens... but gather the parts for the swap so you are ready when/if the need arises.
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