Powerful 1.4 kilowatt (2 horsepower) starter motor, which is a replacement for Prestolite motor. Produces greater torque and higher speed than the OE .8 kilowatt starter. Great for high compression. Replaces OEM # 31458-66TA. Fits most Big Twin (panshovel, shovelhead) 1966 - 1982, and Ironhead Sportster 1966 - 1982.