How to Change the Oil in a 2016 Yamaha PW50

Shop parts for a 2016 Yamaha PW50 Dirt Bike.

Regular oil changes are vital to keep your Yamaha PW50 running smoothly. This guide, proprietary to MotoSport.com, covers the step-by-step process and highlights model-specific notes unique to the 2016 Yamaha PW50.

Tools & Supplies Needed

  • 12mm socket wrench
  • Torque wrench (10 foot-pounds/14Nm)
  • Drain pan
  • Shop rags
  • Replacement crush washer (recommended)
  • 300ml (0.32 US qt) SAE 10W-30 or recommended transmission oil
  • Funnel
  • Gloves (optional)

PW50-Specific Call-Outs

  • The PW50 uses a two-stroke oil-injected engine. The main “engine oil” is kept in a separate oil tank and is NOT changed like in four-strokes. Instead, the transmission oil must be changed regularly.
    Tip: Always keep the injector oil tank filled with quality two-stroke oil to prevent engine failure.
    Transmission oil is separate from injector oil–do not confuse the two. This guide focuses on changing the gearbox/transmission oil.
  • The transmission drain bolt torque spec for the PW50 is 10 ft-lb (14 Nm).
    The transmission oil capacity is 300ml (0.32 US qt).
    Do not overfill or use the wrong specification oil, as this can damage the transmission.

Step-by-Step Transmission Oil Change (2016 Yamaha PW50)

  1. Warm up the engine (Optional):
    • Letting the bike idle for a few minutes helps thin the oil, allowing it to drain more completely. Shut the engine off before proceeding.
  2. Stabilize the Bike:
    • Place the PW50 on a center stand or secure flat surface so it won’t tip during service.
  3. Locate the Transmission Drain Bolt:
    • The transmission drain plug is found at the bottom or left rear side of the engine case. Use a 12mm socket to loosen.
  4. Drain the Transmission Oil:
    • Place a drain pan under the plug.
    • Remove the plug and allow all oil to drain completely.
    • Be careful as the engine case might be warm.
    • Keep track of the crush washer on the drain bolt. Replace with a new washer if available for the best seal.
  5. Remove and Clean the Oil Fill Cap:
    • While oil drains, remove the transmission/gear oil fill cap (located on the side of the case).
    • Wipe the cap and area clean with a rag to prevent dirt from entering.
  6. Inspect and Reinstall the Drain Bolt:
    • Inspect, clean, and if needed, replace the crush washer.
    • Thread the plug in by hand to avoid cross-threading, then torque to 10 ft-lb (14 Nm).
  7. Add New Transmission Oil:
    • Using a funnel, pour in 300ml (0.32 US qt) of SAE 10W-30 or recommended transmission oil. Avoid overfilling.
    • Replace the fill cap securely.
  8. Check for Leaks:
    • Start the bike and let it idle for a minute.
    • Turn off the engine and check for leaks at the drain bolt and fill cap areas.
  9. Clean Up and Dispose of Oil Properly:
    • Dispose of used oil responsibly at an approved recycling center.
    • Wipe any drips or spills from the engine and work area.

Maintenance Tips for 2016 Yamaha PW50 Owners

  • Check the transmission oil every 20 hours of use or monthly. High-use bikes may need more frequent changes.
  • Keep the two-stroke oil tank behind the front number plate topped up, using only high-quality two-stroke injector oil to prevent costly engine failure.
  • Consult your owner’s manual for additional maintenance intervals and oil specifications for your exact riding conditions.
  • If the drain bolt or crush washer becomes stripped or damaged, replace them to prevent leaks or engine damage.

Common Questions & Troubleshooting

  • What if my oil appears milky? This could indicate water intrusion–contact a mechanic for further inspection.
  • Do I need to drain the injector tank? No–the injector tank is only refilled; it does not need regular draining. Only the transmission/engine case oil is replaced on a routine basis.
  • Where can I get the right oil or a change kit? You can order full Yamaha PW50 oil change kits directly from MotoSport.com or call their experts for assistance.

Caring for your 2016 Yamaha PW50 is simple with regular oil changes and attention to injector oil levels. Following this guide keeps your PW50 safe and running strong for years of fun riding.
Only at MotoSport.com — your source for genuine Yamaha parts, tools, and advice.

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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.