Fuel 87 89 or 91 octane?
I have been running 91 octane in our buggys with 145 psi compression and am wondering if it is too high causing carbon build up. Last weekend when the motor on the 183cc buggy was apart with about ten hours on it to replace the case gasket it had a lot of black carbon on the piston and head.
The float level is good and fuel/air screw at 1.5 turns out 125 main with a 35 pilot. Uni filter with a 6 inch intake tube and stock muffler with opend up tail pipe.
It runs good but always has black soot in the tail pipe. My 155cc red buggy with 122 main 34 pilot same intake and muffler set up is clean almost on the lean side.
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