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 Key to making power is an engine that stays together. Eaton has studded the mains for rigidity. The Moldex billet steel crank isn’t fully counterweight for low reciprocating mass. “This crankshaft was balanced to a 1,630-gram bob weight, including considerable overbalance or an increase in the percent value used for reciprocating parts,” Eaton notes, adding he wanted to take this engine to 7,000 rpm.