Single-Fire Mini Ignition Coil Kit - Harley DavidsonMiniature coil intended for custom motorcycles where space is at a premium and a single fire coil is required for maximum performance. 3 ohm primary is compatible with Twin Tec ignitions and most newer aftermarket single fire ignitions. Kit includes two coils, universal spark plug wire set, 90 and 135 spark plug boots and all required electrical terminals. Coils also available separately (two coils required per application). Coil measures 2. 4" L x 2.