The S&S CYCLE Digital Performance Ignition Module is a precision‑engineered, programmable unit designed specifically for Harley‑Davidson motorcycles produced from 1970 through 1999. Housed in a durable gray finish, the module integrates seamlessly into street‑oriented applications, delivering reliable ignition timing while supporting starter and charging system functions. Its digital architecture provides riders with consistent performance across a wide range of operating conditions, ensuring the engine receives the exact spark needed for optimal power delivery.
Available in the HI‑4N configuration for both BT and XL models, the module is supplied as a standalone ignition component, allowing for straightforward installation without additional hardware. The “Ignition Kit HI‑4N 70‑99 BT” option includes everything required to upgrade the original system, while the “Ignition HI‑4N 70‑99 BT/XL” version offers a direct replacement for the factory module. Both configurations maintain the original wiring and mounting points, preserving the bike’s factory aesthetics and functionality.