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Re: cross hatching- on old splash lubed briggs engines, one of the tricks we used to use to keep higher hp engines running longer was lightly scoring the outside of the piston below the ring lands, so that oil mist in the crankcase would more really sick to the rough surface.
Likewise, a mild polish to the exposed areas of the crank and rod would help keep oil off them, reducing rotating/reciprocating mass.
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