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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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