Also Fit most Evolution and Shovelhead engines (carbureted models only, not for fuel-injected bikes). High-Output Single-Fire Coil: High-output single fire coil designed to deliver a strong, consistent spark for reliable ignition performance when properly installed and tuned. Programmable Ignition Functions: Includes multiple adjustable ignition curves for part-throttle and wide-open-throttle use, rear-cylinder timing adjustments available when used with the programming kit. Built-In Safeguards: Intelligent circuitry protects against short-circuits, over-voltage, and over-current ...