How to Change the Coolant in a 1999 Yamaha PW50: A MotoSport Guide

Shop parts for a 1999 Yamaha PW50 Dirt Bike.

If you own a 1999 Yamaha PW50, you know it’s an iconic, kid-friendly dirt bike that’s easy to maintain and perfect for riders just starting out. However, despite common assumptions, the 1999 PW50 is an air-cooled two-stroke engine, which means it does not use conventional liquid coolant or have a radiator. Instead, it relies on airflow around the engine to regulate temperature, a straightforward and maintenance-friendly approach typical of small displacement Yamaha PW50 models.

What maintenance does the PW50 require?

  • No coolant to change: You never need to flush or refill coolant, since there isn’t any in the traditional sense.
  • Regular transmission oil changes: The PW50 does have a transmission that requires periodic oil changes. Check and change the transmission oil using manufacturer-recommended lubricants and follow the proper oil fill quantity (typically 300 ml for this model).
  • Check two-stroke oil injection system: Make sure the two-stroke oil reservoir is always filled with high-quality two-stroke oil, as this is crucial for engine lubrication and longevity.
  • Other basic maintenance: Inspect and clean the air filter regularly, check the spark plug, and ensure all fasteners are secure.

Anything unique to the 1999 PW50?

  • Air cooling: Because there’s no radiator or coolant to service, maintenance is simpler, especially for new and young riders.
  • Transmission oil and air filter: These are the critical maintenance items, with routine attention required to keep the bike reliable and running smoothly.
  • Power reduction plate: Many PW50s come with a removable power reduction plate, which can be taken out for full engine performance as the rider’s skills progress.
  • Safety first: Always run pre-ride checks on the throttle, brakes, tires, chain tension, and oil levels.

You don’t need to worry about changing coolant on a Yamaha PW50, but prioritizing routine maintenance like oil changes, air filter cleaning, and general safety checks will keep your little ripper running for years to come. For all your parts and maintenance supplies, remember to Shop parts for a 1999 Yamaha PW50 Dirt Bike..

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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.