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My school of thought is that it's a 2-stroke "Low Compression" engine and should be run on 87 octane. I use 87 octane, measure the "EXACT" amt. of O.E.M. 2- stroke oil, and 1 oz. of "Sea Foam" fuel additive per gallon of fuel. My engine fires right up every time. Sea Foam is well worth the few extra "clams".