No spark, you might want to check the coils. I have a Kohler Command 18hp that acted the same and i found intermittent spark using a spark tester between the plug wire and plug. I changed out both coil packs and it fixed it. I contemplated off brand but ended up spending the $100 for OEM Kohler. At least thats what they stated.
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Randy
Cubs: 71, 72, 127, 149, 1440, 2186 and 1864
John Deere 110 round fender
John Deere 140 H3
Sears: GTV16
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