This Yimatzu performance CDI applies to (and is not limited to) 125cc 150cc 200cc and 250cc engines. Most commonly used for 150 to 250cc ATVs, dirt bikes, scooter and go-karts/buggies. This unit has one 4 pin and one 2 pin rectangular plug. Casing dimensions at the widest points are L-7cm x W-3.7cm x W-3.0cm and the plug wire length is 13cm.