1. Spar plug gap is not set correctly. The spark plug gap is the distance between the center electrode and the ground electrode. If the gap is too small, the spark will not be able to jump across and ignite the fuel mixture. If the gap is too large, the spark will be too weak to ignite the fuel mixture. The correct gap for a 5hp go-cart spark plug is typically between 0.020 and 0.025 inches.
2. Dirty or fouled spark plug. If the spark plug is dirty or fouled, it will not be able to conduct electricity properly and create a spark. Look for any dirt, debris, or carbon buildup on the spark plug and clean it off.
3. Broken spark plug wire. The spark plug wire is responsible for carrying electricity from the ignition coil to the spark plug. If the spark plug wire is broken or damaged, it will not be able to deliver electricity to the spark plug and create a spark. Check the spark plug wire for any breaks or damage and repair or replace it as necessary.
4. Faulty ignition coil. The ignition coil is responsible for generating the high voltage electricity needed to create a spark. If the ignition coil is faulty, it will not be able to produce enough voltage to jump the gap between the spark plug electrodes. Test the ignition coil to see if it is producing the correct voltage and replace it if necessary.
5. Defective CDI unit. The CDI unit is responsible for controlling the ignition timing and triggering the spark. If the CDI unit is defective, it will not be able to send the correct signals to the ignition coil and create a spark. Test the CDI unit to see if it is functioning properly and replace it if necessary.
