DYNATEK-HARLEY Single-Fire Electronic Ignition System — Harley-Davidson – 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 builds on the famous Dyna "S" by firing the front and rear cylinders independently for much more accurate timing. 🔧

Stock systems fire both cylinders together, which can leave the rear cylinder receiving a wasted spark during its intake stroke; this can cause harder starting, increased engine vibration, backfire, and raw fuel spitback into the carb.

Dyno and top-speed testing show dramatic power improvements throughout the rpm range, with the biggest gains on bikes fitted with hotter cams.

This unit requires special Dyna coils and a tach adapter when using an electric tach; it is not for use on fuel-injected models. 🇺🇸

Made in the USA.