S&S CYCLE HI-4N Ignition Module - Harley Davidson 550-0501

If you're running a carbureted Harley-Davidson and demand precise ignition timing without the complexity of fuel injection systems, the S&S CYCLE HI-4N delivers reliable, tunable ignition control in a single compact module. The all-metal housing and fully enclosed electronics eliminate the variables that plague aging ignition systems—heat degradation, vibration damage, and moisture intrusion—giving you consistent spark delivery lap after lap or mile after mile. With dual switchable firing modes, adjustable advance curves, and rev limiting, you get professional-grade tuning capability without swapping multiple modules.

• Single-fire/dual-fire switchable
• All-metal housing construction
• Improved heat dissipation
• Samarium/cobalt magnets
• High-temperature flux concentrators
• Four rotary control switches
• Adjustable advance rate
• Programmable rev limiter
• Sealed electronics design
• Vibration/moisture/dirt resistant
• Timing degree markings included
• Carbureted models only
• Bolt-on installation
• Made in U.S.A.
• MPN: 550-0501