Magneto Cap and Rotor fits X4B16U FM-X4B16V X4B16V FM-X4B16W X4B16W X4B17C AS9 This kit includes the rotor, cap, brush, lead rod, and gasket. Fits engines equipped with the following Fairbanks Morse magneto numbers:  FM-X4B16U,     X4B16U,     FM-X4B16V     X4B16V,      FM-X4B16W,     X4B16W,       FMX4B17C,    X4B17C