How to Change a Spark Plug in a 1990 Yamaha YFM350ER MOTO-4

Maintaining your 1990 Yamaha YFM350ER MOTO-4 is essential for optimal performance, and changing the spark plug is a key part of that maintenance. Before you start, make sure you have the correct replacement spark plug and the necessary tools.

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Tools and Materials Needed

  • Replacement spark plug
  • Spark plug socket
  • Socket wrench
  • Torque wrench
  • Gapping tool

Steps to Change the Spark Plug

  1. Locate the Spark Plug: The spark plug on the YFM350ER is located on the engine's top side. Remove any covers or components that obstruct access.
  2. Remove the Spark Plug Cap: Gently pull the spark plug cap off the plug. Be careful not to damage the wire.
  3. Remove the Old Spark Plug: Use the spark plug socket and wrench to unscrew the old spark plug. Turn counterclockwise until it is free.
  4. Check the Gap on the New Spark Plug: Use a gapping tool to ensure the new spark plug is set to the manufacturer's recommended gap.
  5. Install the New Spark Plug: Carefully thread the new spark plug into the engine by hand to avoid cross-threading. Once hand-tight, use the torque wrench to tighten it to the specified torque setting.
  6. Reattach the Spark Plug Cap: Push the spark plug cap back onto the new plug until it clicks into place.
  7. Reassemble Any Removed Parts: Replace any covers or components that were removed to access the spark plug.

Additional Tips for YFM350ER Owners

The 1990 Yamaha YFM350ER MOTO-4 is known for its durability and reliability. Regular maintenance, including spark plug changes, will ensure it continues to perform well. Always use high-quality parts and follow the manufacturer's specifications for the best results. Additionally, check other components like the air filter and oil levels regularly to keep your ATV in top condition.

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Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.