Replacement CDI modules, ignition coils, and related ignition parts for Yamaha, Honda, Kawasaki, Suzuki, Polaris, Can-Am, Arctic Cat, and CF Moto ATV and UTV models. A faulty CDI unit or ignition coil is one of the most common causes of hard starting, misfiring, and no-spark failure. OEM cross-reference part numbers are listed on each product page — if unsure, contact us with your make, model, year, and OEM number.