Dynatek Two-Stage Rev Limiter For Harley Dynatek Two-Stage Rev Limiter has been designed for the odd firing angle of Harley V-Twin giving you the precise control over-revving and launch Rpm. Features: Over-rev limit guarantees against damage due to missed shifts or drive train breakage adjustable from 5500 to 9250 RPM Launch limit gives maximum off-the-line performance adjusts between 2500 and 6250 RPM in 250 rpm increments Spares unnecessary poundings of expressive engine components Note: Designed for use with dual or single fire ignitions and is perfectly compatible with the Dyna S and Dyna 2000 ignition systems. Also compatible with Twincam and Harley M8 ignition systems. It is not compatible with coil on plug systems.