How to Change the Coolant in a 2019 Yamaha PW50: A MotoSport.com Step-by-Step Guide

Shop parts for a 2019 Yamaha PW50 Dirt Bike.

The Yamaha PW50 is a legendary entry-level dirt bike, popular for its approachable size, low-maintenance two-stroke engine, and bulletproof reliability. However, it’s important to note that the 2019 Yamaha PW50 is air-cooled, not liquid-cooled, and therefore it does not use engine coolant or a radiator. Instead, this minibike relies on airflow over its cylinder fins to dissipate heat. Coolant maintenance procedures do not apply to this model, but regular maintenance of oil and air filter is critical for performance and engine life.

PW50 Maintenance Essentials

  • Oil System: The PW50 uses an oil injection system. Always make sure the oil reservoir is filled with high-quality two-stroke oil specifically designed for injection systems.
  • Transmission Oil: Change the transmission oil regularly. Place a drain pan under the bike, remove the drain plug using a 12mm socket, and allow the oil to drain completely. Replace the crush washer, reinstall and torque the drain bolt to 10 ft-lbs, then refill with 300ml of recommended transmission oil before reinstalling the cap.
  • Air Cooling: Keep the cooling fins on the cylinder free of dirt, debris, and mud to ensure proper air flow and cooling. Clean the fins as part of your regular maintenance routine.
  • Air Filter Maintenance: Service your air filter frequently, especially if you ride in dusty conditions. Always use air filter oil after cleaning, and consider a spare ready-to-go filter for quick swaps. A clean air filter promotes strong performance and engine longevity.

Other Noteworthy PW50 Features

  • Shaft Drive: The PW50 features a maintenance-free shaft drive, eliminating hassle of chain adjustments and lubrication.
  • Simplicity for Beginners: With no clutch lever, a fully automatic transmission, and a low seat height, the PW50 remains a top choice for young riders and families.
  • Speed Limiter: Use the throttle stop screw to reduce engine power and speed for learning riders, and adjust it upward for more experienced kids.

Final Reminder

While the Yamaha PW50 doesn’t require radiator or coolant maintenance, keeping up with oil changes, keeping cylinder fins clean, and maintaining the air filter will ensure years of trouble-free riding. Always reference your owner’s manual for specific maintenance intervals and use MotoSport.com for genuine parts and trusted gear for your PW50.

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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.