Posted by George Marsh on August 30, 2014 at 07:19:22 from (184.16.226.193):
I'm trying to remove carbon form a 20 hp kohler command that has 1500 hours. The engine doesn't use a drop of oil. It has always run rich, especially when carb needs cleaning. I've used a hotter plug, only to have it diesel, run backwards, when it been run hard and I turn it off.
There is absolutely no carb adj. Started the experiment with new air filter and using e15 blend, 88 octane.
Last tank was a E17.5 90 + octane blend. I use 1/2 gal e85 and 4.5 gal e10 89 octane. Final cost is about $.05 more per gallon.
Well the spark plugs look better than the spark plugs in my Kaw 4010 EFI mule which only has 130 hours. Looking through spark plug hole, I'm seeing less and less carbon build up on piston. In places I'm seeing the aluminum poston.
This time while I had the plugs out, I decided to use my HF spark plug cleaner. Next tank, I'll pull plugs and post a pic.
So far so good. No hole in piston, no carb or fuel pump failure. No noticable loss of power. Engine runs good. I do notice a need for a small amount of choke for about the first 15-20 seconds, which in the past no choke needed after it starts.
I'm convinced I headed in the right direction, pending a hole in piston, e17.5 harming the carb or fuel pump.
After another 10 gallons of e17.5, which Ive already blended. I plan to pull plugs, take a pic. I may go back to e15 blend to see what happens. Kinda of wish I had a camera to take a better look and see inside cylinder. I think I may be taking a trip to HF soon.
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