DYNATEK-HARLEY Single-Fire Electronic Ignition System — Single-fire, electronic, black/gray – 70-86 Big Twin, 79-98 Touring, 85-99 Softail, 91-98 Dyna, 82-94 FXR, 84 Police, 70-03 Sportster

The Single-Fire Electronic Ignition System replaces the stock wasted-spark setup by firing the front and rear cylinders independently, allowing precise timing for each cylinder. ⚡️

Unlike the stock system, which fires both cylinders together and can send a wasted spark into the rear cylinder during its intake stroke, this single-fire system improves starting, reduces vibration and backfire, and prevents raw fuel from being spit back into the carb.

• Improved power across the rev range; dyno and top-speed testing show dramatic gains, especially on bikes with hotter cams.
• Not recommended for use with OEM coils; this unit must be used with special Dyna coils.
• On 84-up Harley-Davidsons, an advance weight mechanism is required.
• Tach adapter required when using an electric tach.
• Not for fuel-injected models.
• Made in the U.S.A.

If you want to get the most out of a stock, lightly modified or fully customized Harley-Davidson, install a Dyna "S" single-fire ignition system. 🔧