Posted by George Marsh on August 12, 2014 at 07:19:53 from (184.16.227.119):
I purchased my 2004 terramite used when it had 430 hours on it. The left spark plug was completely carboned up. I cleaned carb, new air filter, helped a little, but still a carbon problem and a dieseling when engine was hot after working hard. Engine would ran backward. I concluded there had to be pre-ingniton, pinning. Engine doesn't use oil, very good compression, 1500 hours on it. Good running engine.
There are no fuel adjustments on carb. If you can find any, post pic. I've looked, nothing at all.
That's when I decided the only way to lean out fuel mix was with E15. I made my own using E85 and 93 octane.
After 5 hours, I pulled the plugs. There appeared to be a white ash on plug. Like the white ash you get burning charcoal, carbon. There also appears to be places on the top of piston where the carbon layer is burning off. Piston looks good. No pitting.
I posted pics of the old and new plugs. New plugs have 10 hours on the.
I think I'll see what happens on the next 5 gallons before I change E ratting. I really don't care about the fuel pump, if it's damaged it won't cost that much. Worst case, Engine is only about $1500.
The camera doesn't show the results as well as in person. Look at the very end of plug near the threads. Very black on the right plugs. Not so black on the left plugs.
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