Don't forget about the k90, predecessor to the k91! I happen to have bought one a couple weeks ago. They are cool little engines.
Perhaps some pictures of this mystery Kohler, so we can try to identify it for you?
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'70 107 with k301 engine swap
'71 106 with 38" deck
'70 147 R with factory replacement k321, 42" deck
'61 Original with 38" timed deck
'63 70 "pinkie"
1863 with 54" deck
'46 Farmall H, '50 Farmall Cub
105 x2 (parts)
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