Rebuilt & worked on more than a few Kohler's, years ago ...
Pretty much thought the ''smaller ones'' were a weak construction.
Would take an old Tec. or Briggs. over those ''smaller ones'' any day.
Their ''old'' Large engines were pretty stout though.
Added,,
Have a Buddy that raced a ''$ht & Git'' lawn tractor years ago, with a ''big'' Kohler engine in it,, - '' Go Kart slicks & everything'',, but can't remember the size...
I kind'a remember the ''big'' old Tillotson carb that I tweaked & set up on it though.
The carb was about the size that you would put on old hot rod Harley's.
Thing was frigg'n fast !