S&S Cycle HI-4N Ignition Module for 1970-1999 Harley-Davidson Big Twin

S&S Cycle HI-4N Ignition Module for 1970-1999 Harley-Davidson Big Twin

Upgrading to the S&S Cycle HI-4N ignition module transforms your Big Twin’s ignition performance with more accurate timing and a stronger spark than stock. With both single-fire and dual-fire modes in one unit, it adapts to a wide range of engine configurations. Fully enclosed electronics resist vibration and moisture, so your ignition stays reliable and your engine runs cleaner mile after mile.

Key Features

• Single-fire and dual-fire function built into a single module for flexible configuration
• All-metal housing provides improved heat dissipation and long-term durability
• Four rotary switches for easy ignition mode selection, advance rate, and rev limit
• Fully enclosed electronics resist vibration, moisture, and dirt for reliable operation
• Ignition advance and timing degree markings on the metal flange for easy setup
• Sensor housings use high-temperature samarium/cobalt magnets for accurate triggering
• Made in the USA

Technical Specifications

• Application: 1970-1999 Harley-Davidson Big Twin, 1971-1985 Sportster XL
• Function: Electronic ignition module, single-fire and dual-fire
• Housing: All-metal for heat dissipation
• Controls: 4 rotary switches – mode, advance rate, rev limit
• Origin: Made in USA

Fitment Notes

• Fits 1970-1999 Harley-Davidson Big Twin engines (Shovelhead and Evolution) and 1971-1985 Sportster XL
• Not designed for fuel-injected models – carburetor applications only
• Does not fit 1999-Up Twin Cam Big Twin engines
• Verify ignition sensor compatibility before ordering
• Review the Fitment tab for complete year and model compatibility