With Rev Limiter For 4-stroke GY6/QMB139 engines 6-pin connector Easy to install Capacitor discharge ignition (CDI) module (ignitor) for gas scooters, ATVs, dirt bikes, and go karts with 4-Stroke GY6/QMB139 or Honda-style engines This CDI is equipped with a 6 pin square connector with the pins arranged horizontally Description Capacitor discharge ignition (CDI) module (ignitor) for gas scooters, ATVs, dirt bikes, and go karts with 4-Stroke GY6/QMB139 or Honda-style engines. This CDI is equipped with a 6 pin square connector with the pins arranged horizontally.Please study the photo before ordering.This CDI is equipped with a “rev limiter”, which limits the RPMs (speed), of the engine.Commonly used on Baja Motorsports, Honda, Roketa & SunL scooters and ATVs.Note: 4-stroke and 2-stroke engines require different engine timing. Though they may appear visually similar, a CDI module from a 4-stroke engine cannot be interchanged with a CDI module from a 2-stroke engine.