How to Change the Coolant in a 1998 Yamaha PW50

Shop parts for a 1998 Yamaha PW50 Dirt Bike.

If you own a 1998 Yamaha PW50, keeping your bike in top running shape is essential for fun and reliability on the trails. Many riders wonder about the coolant change process–but the Yamaha PW50 is unique among dirt bikes: the PW50 air-cools its engine rather than using a liquid-cooled system. In other words, the 1998 PW50 has no coolant to change as it does not have a radiator or coolant passages.

Instead, the PW50 uses ribbed cylinder and head fins to dissipate engine heat directly into the air as you ride. This keeps maintenance simple and lightweight–ideal for a beginner bike.

What You Should Maintain Instead:

  • Engine Oil: The PW50 uses a two-stroke oil-injection system. Check and refill the oil tank with two-stroke oil regularly.
  • Transmission Oil: Change the transmission (gear) oil periodically for long transmission life. Use the correct oil and quantity specified by Yamaha.
  • Air Filter: Clean and oil the air filter often–it is critical for engine protection on dusty trails.
  • General Inspection: Inspect throttle, cables, brakes, tires and ensure all nuts and bolts are secure before each ride.

Key Notes for PW50 Owners:

  • No coolant flush or refill is ever required on this model due to its air-cooled engine design.
  • Frequent oil changes, a clean air filter, and overall safety checks will keep your PW50 running reliably for years.
  • Always use high-quality two-stroke oil for optimal engine performance–avoid running the tank dry, as lack of oil can cause severe engine damage.
  • Refer to your owner's manual for specific service intervals and capacities.

With these simple steps, your Yamaha PW50 will deliver years of low-stress, easy-to-maintain riding excitement. If you need oils, filters, or spares, MotoSport has you covered for all your 1998 PW50 parts and accessories.

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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.