I will add as a homeowner "only" that my owner's manual is a disservice with "weasel wording" regarding heat. I am still of the opinion that "small" air cooled engines are always near the edge of one or another kind of head failure due to overheat (cyl head warpage,blown gasket, valve seat loosens, valve guide loosens, pushrod dislodges etc).
The engines should have as a minimum a head heat sensor with a dash mounted warning lite. The manual should warn innocent homeowners to shut down and rest the mower until the lite goes out.
IMO this simple fix would allow diligent owners to extend the life of the "low end" units indefinitely. From the little I have seen Kohler did use such a failsafe in form of cutout switches. Replacement cost starts at $75/kit online. This means factory install /retail cost adder should be less than $50. Elsewhere in this forum I discuss them at $25-$50 diy.
My Intek was apart twice and the components looked good both times except for the head (and the missing exh cam lobe). I believe that "the industry " is used to air cooled failures and accepts them. No offense to that industry, but expectations play a big role. Flame suit is on. :2cents: