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this may be a stupid quest but what determines the rpm of the engine ? in other words who or what decides ur RPM .if u only want ur engine to turn say 5-6000 and no more .or is it ur foot .i know that spinning a engine out of range is asking for bottem end failure spent bearring ,thrown rods and other problems that pretty much destroys ur hard work of building a motor . i really dont plan on spinning mine no more than 6000 rpm