How to Change the Coolant in a 1989 Yamaha PW50: MotoSport's Guide

Shop parts for a 1989 Yamaha PW50 Dirt Bike.

If you are the proud owner of a 1989 Yamaha PW50, keeping your mini moto in top running condition means paying close attention to basic maintenance. However, the Yamaha PW50 is air-cooled, not liquid-cooled, so it does not use coolant or have a radiator system. Unlike many larger dirt bikes, the PW50 relies on air passing over its cylinder fins–not a cooling system that uses fluid–to regulate engine temperature.

What this means for owners:

  • No coolant changes are required for the 1989 PW50. There is no radiator, overflow reservoir, or coolant hose maintenance necessary.
  • Focus instead on regular air filter cleaning, spark plug checks, oil changes, and keeping the cylinder fins clear of mud and debris to ensure maximum cooling efficiency.
  • Always check for dirt or obstructions on the fins, as these can insulate the engine and cause it to overheat.
  • The lack of a liquid cooling system makes the PW50 easier to maintain—perfect for youth riders and those new to dirt bike ownership.

If you are looking for maintenance guidance for your PW50, it is important to follow the service schedule for air filter cleaning/oiling, transmission oil change, and basic bolt checks rather than a coolant flush. Should you need parts for any repairs or maintenance, MotoSport covers all the essentials for your 1989 PW50–from OEM components to performance upgrades.

Remember: If you move up to larger, liquid-cooled dirt bikes in the future, learning to change coolant becomes an important skill. For the PW50, just enjoy the simplicity and ease of air-cooling and keep the engine clean for dependable performance every ride.

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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.