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Wider than stock, thus stronger starter clutch gear for 1991 thru 1999 Evolution Big Twin and 1999 thru 2006 Twin Cam, except 2006 Dyna's. Fits OEM as well as many 1.2 and 1.4 kW aftermarket starter motors. Replaces starter clutch gear in OEM 31663-90 & 31516-94 starter clutches and takes stock bearings and output shaft. Features Limited Lifetime Warranty.