Spyke Dual Fire Coil For Harley Big Twin Features The Spyke 80,000-volt, 3 ohm, high-amperage coils could be just what you're looking for to power up your dual-fire ignition These coils have an extremely quick rise/fall time which equate to a much hotter spark They also fire at extremely low voltage to aid in firing your bike when the battery is low Mounts in stock location using the stock cover