How to Change the Coolant in a 2021 Yamaha PW50

Shop parts for a 2021 Yamaha PW50 Dirt Bike.

The Yamaha PW50 is a legendary entry-level dirt bike, renowned for its simplicity, reliability, and oil-injection two-stroke engine. Unlike many other dirt bikes, the 2021 PW50 does not use liquid coolant or have a radiator–it is an air-cooled model. As such, there is no coolant to drain or change on this bike. This feature makes maintenance more straightforward, especially for new riders and parents supporting young dirt bike enthusiasts.

Instead of a coolant change, routine maintenance should focus on:

  • Two-stroke oil: Maintain the correct level in the oil injector reservoir. Use a high-quality two-stroke oil suitable for air-cooled engines.
  • Air filter: Regularly clean and oil the air filter, especially if riding in dusty or dirty conditions. A clean filter ensures proper airflow, helping to keep the engine temperature in check.
  • General inspection: Check spark plug condition, adjust the throttle and brake cables, and inspect the tires, brakes, and chain tension regularly for optimal performance and safety.

Key Model-Specific Notes for PW50 Owners

  • No radiator or coolant: The PW50 is fundamentally different from many larger bikes requiring coolant changes. Engine cooling is achieved only through airflow over the engine's fins.
  • Simplicity in maintenance: With no liquid cooling system, there is no risk of coolant leaks, radiator failure, or related issues. Focus maintenance attention on the oil injector system, air filter, and basic mechanical checks to maximize longevity.
  • Use the correct oil: Never run the PW50 without oil in the injector tank. This is critical to preventing engine damage.

While there is no coolant system to service on the 2021 Yamaha PW50, keeping up with its specific air-cooled maintenance requirements will ensure your machine provides years of reliable fun. For all your OEM and aftermarket parts, MotoSport.com has you covered.

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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.