If your Yamaha 350 Warrior ATV is not producing a spark, there are several potential causes to check. Here's a troubleshooting guide to help you diagnose and fix the issue:
1. Verify the Starter and Coil Connection:
- Ensure the starter and ignition coil are correctly connected. Make sure all electrical connections are tight and free of corrosion.
2. Spark Plug Check:
- Remove the spark plug and inspect it for damage, wear, or fouling. If the plug is worn or damaged, replace it with a new one.
- Check the gap between the spark plug electrodes and adjust it to the recommended specification found in your ATV's service manual.
3. Test for Power Supply:
- Use a multimeter to test if the ignition coil is receiving power from the vehicle's electrical system. Check for continuity between the ignition coil's positive terminal and the battery's positive terminal.
4. Check the Ignition Coil:
- Remove the ignition coil and inspect it for signs of damage or overheating. Look for cracks or burn marks on the coil. If the coil is damaged, replace it.
- Test the resistance of the ignition coil using a multimeter. The primary coil should have a low resistance value (typically between 0.5 and 2 ohms), and the secondary coil should have a high resistance value (several thousand ohms).
5. Inspect the Ignition Module:
- The ignition module controls the spark timing. Check the module's connections and inspect it for any damage or corrosion.
- If the ignition module is faulty, replace it according to your ATV's service manual.
6. Test the Pick-up Coil:
- The pick-up coil generates a signal to the ignition module. Check the connections and inspect the pick-up coil for damage.
- Test the resistance of the pick-up coil using a multimeter. Refer to your ATV's service manual for the expected resistance value.
7. Check the Magneto Housing and Flywheel:
- If the ATV has a magneto system, inspect the magneto housing for damage or cracks. Also, check the flywheel for cracks or loose magnets.
8. Follow the Wiring Diagram:
- Refer to the wiring diagram in your ATV's service manual to ensure that all electrical connections are correct and there are no broken wires.
9. Check the CDI Unit:
- If your ATV has a CDI ignition system, test or replace the CDI unit if necessary.
10. Consult a Professional:
- If you're unable to identify or fix the problem, it's best to consult with a qualified ATV mechanic or service center.
By following these steps, you can troubleshoot the no-spark condition on your Yamaha 350 Warrior ATV. Remember to always follow safety guidelines and refer to the service manual specific to your model for accurate information.
