- 12 volt high performance dual output coil - Late OEM style molded plastic case - High quality, molded epoxy - Capable of 35,000 volts - 3.5 ohm primary resistance - Replaces Harley Davidson part no. 31609-80 - Fits 1980-1984 Sportster, Big Twin - Increases peak spark voltage by 20% or more. Bolts into standard location on all Harleys. Improves starting, stops high speed misfires, increases mileage and overall performance. -1 year warranty!! - #5-2028