Accel's Power Pulse 12-volt 4.2 OHM coil features greater available spark voltage, faster rise time, and longer spark duration than OEM coils. Molded in brightyellow impact resistant thermoplastic compound, this Accel coil is guaranteed to improve starting, midrange throttle response, and two-end performance on points-triggered or Prestolite electric ignition Harleys. A potent combination when teamed up with the Super Plate, Accel 8.8 ignition wires, and U-Groove spark plugs. For Big Twin and Sporster molded style coils 1965-1983. OEM # 31609-65A