How to Change the Coolant in a 1997 Yamaha PW50

Shop parts for a 1997 Yamaha PW50 Dirt Bike.

The 1997 Yamaha PW50 is a legendary entry-level dirt bike, renowned for its lightweight frame, automatic transmission, and oil-injected two-stroke engine. But before you reach for the radiator cap, it is important to note: the PW50 is air-cooled – it does not use liquid coolant like most modern dirt bikes. The cylinder and engine rely on air flow and fin design to dissipate heat, requiring no traditional coolant flush or radiator maintenance. This air-cooled system keeps things simple and reliable, making routine maintenance much easier for new riders and parents.

However, keeping your PW50 running cool and trouble-free means focusing on the following:

  • Check the engine fins on the cylinder and head regularly. Make sure they are clean, undamaged, and free of dirt or debris that could block airflow.
  • Inspect the oil injection system, as it is crucial for engine lubrication and cooling on the PW50. Use only high-quality two-stroke oil and ensure the tank is topped off.
  • Always ride with sufficient airflow. Avoid prolonged idling or low-speed riding on hot days, as these conditions reduce cooling efficiency.

Additional PW50 Maintenance Notes:

  • This model features an oil-injection reservoir under the seat. The tank must be kept filled with approved two-stroke oil compatible with Yamaha's autolube system.
  • Transmission oil changes are also essential. Place the bike on the centerstand, remove the transmission drain bolt and filler cap to drain, then refill to the specified capacity.
  • Follow Yamaha's suggested intervals for air filter and spark plug checks, as clogged filters or fouled plugs can impact cooling and engine longevity.

Keeping up with these simple checks – and understanding that the PW50's cooling system is air-based – will keep your mini moto running smooth lap after lap.

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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.