How do you check the cdi box on an ATV?

To check the CDI (Capacitor Discharge Ignition) box on an ATV, first ensure the ATV is turned off and disconnect the battery for safety. Locate the CDI unit, which is usually found near the engine or under the seat, and inspect it for any visible signs of damage, such as cracks or corrosion. You can also use a multimeter to test the CDI's continuity and resistance according to the manufacturer's specifications. If the CDI appears faulty, it may need to be replaced.