Fits most Chinese-made electric start upright engines including 49cc, 50cc, 70cc, 80cc, 90cc, 100cc, 110cc, 125cc models. Compatible with ATV, Coolster, Quad Bike, Dirt Bike, Pit Bike, Go Kart, Kawasaki KLX, 4 Wheelers, Scooter, Buggy, Motowork, Dune, and Taotao.Kit includes: 12 Volt Ignition Coil, 5 PIN CDI BOX, 4 PIN Regulator, Solenoid Relay, and Spark Plug. Designed for use with ATV, Quad, Kawasaki KLX, Coolster, Scooter, 4 wheelers, Buggy, Dirt Bike, Go Kart, Pit Bike, and similar models.This kit includes a 2-pin Male Plug Relay, Ignition Coil with 135 Degree Elbow, 12V 4-pin Voltage Regulator, and 5-pin CDI. Does not fit GY6 engines.Compatible with various brands such as Atomik, Pitpro, Hummer, Orion, Xmoto, Lei, DMX, SWD, TDR, DDR, Tommahawk, Monsoon, Grudge, Kazuma, Bull, Trooper, Hunter, Motox, Trojan, Blitz, Crusade, Link, Bigfoot, Kuda, Motoworks, Nitrous, Reign, Fury, Prox, Raider, Zongshen, Loncin, Ducar, Lifan, Thumpster, Thumbstar, and Chongqing.Package contents: 5-Pin CDI Module, 2-Wire Ignition Coil, Starter Relay Solenoid, 4-Pin Voltage Regulator Rectifier, and Spark Plug. Fits 50cc, 70cc, 90cc, 110cc, 125cc, and 140cc horizontal engines for bikes, quads, ATVs, and buggies. Items match the pictures shown.