55-1571 Ign Coil Single Fire for Ist

This high-output single fire ignition coil from S&S is designed for use with IST ignition systems. It features a 3-ohm primary resistance, optimized to deliver a powerful spark for improved combustion and engine performance. Single fire coils are essential for performance-oriented Harley-Davidson setups, as they fire each spark plug independently to eliminate the wasted spark on the exhaust stroke and reduce engine vibration. S&S constructs these coils with high-quality internal windings to ensure consistent voltage delivery under heavy loads and high heat. This black molded coil is sold individually and provides a reliable electrical component for high-performance ignition configurations requiring a 3-ohm coil.