Possible Causes:
* Loose or Damaged Spark Plug Wire: The wire that connects your spark plug to the ignition coil can be loose, cracked, or have a bad connection. This prevents a strong spark from reaching the plug.
* Faulty Ignition Coil: The coil is responsible for generating the high-voltage spark. A failing coil won't produce enough energy to ignite the fuel-air mixture effectively.
* Bad Spark Plug: A worn-out or fouled spark plug can fail to create a reliable spark. This can be due to:
* Gap Issues: The gap between the electrodes is critical. If it's too wide, the spark may be weak. If it's too narrow, it might short-circuit.
* Carbon Buildup: Excessive carbon deposits can hinder the spark's passage.
* Corrosion: Moisture and other elements can cause corrosion on the spark plug's electrodes, affecting conductivity.
* Stator or Pickup Coil Issues: These components are responsible for sending signals to the ignition system, triggering the spark. Damage to either can disrupt the timing and cause misfires.
* Loose or Damaged Wiring: Other wiring within the ignition system, connecting the stator or pickup coil to the ignition coil, can be problematic.
Troubleshooting Tips:
1. Inspect the Spark Plug Wire: Check for cracks, fraying, or loose connections at both ends. Make sure it's securely attached to the spark plug and the ignition coil.
2. Inspect the Spark Plug: Remove the spark plug and examine it.
* Gap: Make sure the gap is set to the manufacturer's specifications (usually around 0.028 - 0.032 inches).
* Condition: Check for carbon buildup, corrosion, or damage to the electrodes. If necessary, clean or replace the plug.
3. Test the Spark Plug: Connect the spark plug wire to the spark plug and ground the plug (metal part) to the engine. With the engine cranking, you should see a bright blue spark jump the gap. If the spark is weak or absent, you have a problem in the ignition system.
4. Test the Ignition Coil: While more complex, you can test the ignition coil's output using a spark tester or multimeter. If it's not producing the proper voltage, you'll need to replace the coil.
5. Check for Electrical Issues: Inspect all wiring in the ignition system for loose connections, broken wires, or corrosion.
Important Note: If you're not comfortable working with electrical systems, it's best to seek professional help from a qualified mechanic. They can diagnose the problem accurately and perform necessary repairs safely.
Let me know if you have any other questions about your Big Bear 350!
