Thanks for your input. I bought a used 2004 terramite T5c when it had 435 hours on it and it was 4 years old. When I got it, the left plug was conpletely fouled out. Replaced plug and it ran fine. Some said I had a head gasket problem. Compression test was good, Leak down test was good.
The guy at the small engine shop sold me the next hotter plug, but the left side still had an issue.
Then I discovered the carb needed cleaned. That helped a lot, but engine was still making carbon. Hotter plug caused it to diesel, run backwards. Probably the carbon build up increased compression a little.
All the snake oil ways to remove carbon wasn't that appealing to me, even it they worked, it didn't solve the problem, too rich.
That's when I decided to try an ethanol mix to lean it down. Went with a higher octane, just in case things may get hotter and pop a hole in piston. I also went back to the OEM cooler plug.
Early results show it working. Using 89 octane is within my retired budget. By mixing a gallon of e85 to 9 gallons of 89 octane, I'm saving $.60 using e 85. and 9 gallons of 89 octane is costing me about $1.20 more, so total increase cost is about $.60 for 10 gallon blend. It might crimp my style a little, but worth it to have a clean burning engine. Hoping to extend the life of the girl. Some say 1500 hours on a kohler 20 hp command is like running on borrowed time. I don't think so. Engine is rock solid.
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