Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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How have you been testing the suspected bad ones?
They are a commonly replaced item, but certainly not to the degree you are describing. I would recommend asking you Kohler dealer to contact the disctributor and see what they will do for you. This is very unusual.
Is there anything about the fuel, perhaps? What brand, grade, and age of fuel are you using?