Small high output air cooled engines run hot. Heat contributes to knock/detonation which goes unheard over the exhaust noise. Small engines can also run lean due to carb adjustments, dirty jets or failing crankcase seals on some two strokes. Lean mixtures contribute to detonation. Idling and/or mixing too much lube oil or using a high ash lube oil. Contributes to combustion chamber deposits which can glow and pre-ignite the air/fuel mixture. So for the pennies a day difference to operate a small engine on premium or 100LL. It's cheap insurance. b.t.s. how many times has somebody had a two stroke engine apart with a hole melted in the piston and thought poor lubrication? Not so, that is detonation damage. Detonation can also crush ring lands and break rings which cause cylinder wall scoring. Once again it wasn't a lube problem, it was detonation. Too much lube oil also makes the engine prone to detonation.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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