JD Seller, My 2004 20 hp kohler has 1500 hours on it. I bought it used with 400 hours on it. The left cylinder plug was fouled out. Replaced it, but the left side would carbon up. Never burns oil. I did a leak down test, showed good. So I would rotate spark plugs. Put the left side in the right side, where the right side would burn the carbon off. About a year later I discovered the carb needed cleaned. That somewhat fixed the carbon on the tip of plug, but not everything. I no longer have to rotate plugs.
I just wish the carb had adj jets. Engine would diesel and run backward when I shut it off after a good workout.
Now I'm experimenting with making 94 octane E15. That seems to help cool things down. Still not 100% there, but an improvement. No loss of power, seems to like what I've done.
Now I have something weird happening. Ever hear of the kill wire on the mag not working? The kill wire on just one coil works, other doesn't. So when I turn key off, engine keeps running on one cylinder. I replaced the wires going from switch to mag coils. Still runs on one cylinder. I removed the kill wire from switch, shorted out kill wire, same problem, so it's not my switch.
My tractor came with a gas solenoid valve. When I turn the key off engine runs out of gas in 5 seconds, no way to diesel. George
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