How to Change the Oil in a 2014 Yamaha PW50: A Comprehensive Guide for MotoSport.com

Shop Parts for a 2014 Yamaha PW50 Dirt Bike.

If you ride or maintain a 2014 Yamaha PW50, knowing how to change its transmission oil is essential for continued engine reliability and performance. This step-by-step guide gives you everything you need to accomplish the oil change efficiently and correctly. While the PW50 features a separate injector oil tank for its two-stroke engine, the transmission oil still needs regular attention. Here’s everything you’ll need to change the transmission oil for your 2014 Yamaha PW50.

Tools and Supplies Needed

  • 12 mm socket and ratchet or wrench (for drain bolt)
  • Torque wrench (to ensure proper tightness for reassembly)
  • Drain pan (to catch old oil)
  • Funnel (for filling new oil)
  • Clean rag or paper towels (for wiping up spills and cleaning parts)
  • Replacement transmission oil (Yamaha recommends 0.30 L of oil – check your manual for the exact required type; Yamalube is commonly used)
  • New crush washer (recommended anytime the drain bolt is removed)
  • Socket extension (optional, but may be helpful for access)
  • Gloves (recommended for keeping hands clean)

Recommended Types and Quantities of Oil

  • Transmission oil type: As per Yamaha’s specifications, use a high quality gear/transmission oil fit for small motorcycles and mopeds. Yamalube is recommended.
  • Capacity: 0.30 liters (approximately 0.32 US quarts or 300 milliliters)

Step-by-Step Oil Change Instructions

  1. Warm Up the Engine
    Purpose: Warming the engine allows the oil to flow out more easily, ensuring a complete drain.
    Start the PW50 and let it idle for 2-3 minutes. This heats up the transmission oil. Then, turn off the engine and place the bike on a secure stand or level surface.
  2. Locate the Drain Bolt
    The drain bolt is found on the bottom of the transmission case. Use your 12 mm socket to identify and prepare for removal.
  3. Position the Drain Pan
    Slide a drain pan directly under the drain bolt area to catch all the used oil.
  4. Remove the Drain Bolt
    With your 12 mm socket, carefully loosen and remove the drain bolt. Be mindful of the crush washer under the bolt—it is advisable to have a replacement on hand. Allow the old oil to drain thoroughly into your pan.
    Model-specific tip: The drain bolt should be torqued to 10 foot-pounds (14 N·m) during reinstallation. Always double-check for the crush washer to ensure a leak-free seal.
  5. Remove and Clean the Oil Fill Cap
    While the oil is draining, remove the oil fill cap on the side case. Clean it thoroughly—this prevents dirt or debris from contaminating the new oil.
  6. Replace the Crush Washer and Reinstall the Drain Bolt
    Clean the drain bolt with a rag. Install a new crush washer onto the bolt. Reinstall the drain bolt and tighten securely using a torque wrench to 10 foot-pounds (14 N·m). Proper torque prevents future leaks.
  7. Refill with New Oil
    Place a funnel into the oil fill opening. Pour in 300 ml (0.30 liters) of the recommended transmission oil. Be careful not to overfill.
  8. Reinstall the Oil Fill Cap
    Securely reinstall the fill cap. Confirm it is tight but do not overtighten.
  9. Clean Up
    Wipe up any spills and properly dispose of the old oil according to local environmental regulations.
  10. Check for Leaks & Test Ride
    Start the PW50, let it idle for a minute, and inspect the drain bolt and fill cap area for any signs of leakage. If everything is tight and dry, take a short test ride. Re-inspect again for leaks.

2014 Yamaha PW50 Specific Call-Outs

  • The PW50 uses a 2-stroke engine with a separate oil injector system. This procedure is for the transmission oil, not the injector oil.
  • Be sure the oil injector reservoir (located behind the number plate) is always filled with the correct 2-stroke oil, as running low can cause severe engine damage. Monitor the minimum level mark.
  • The transmission uses 0.30 liters (300 ml) of oil. Do not overfill.
  • Always use a new crush washer to prevent leaks after reinstallation of the drain bolt.
  • Do not overtighten the drain or fill bolts; proper torque is crucial for engine health.

Additional Maintenance Tips

  • Check the 2-stroke oil injector tank regularly and keep it filled to prevent engine damage.
  • Inspect the transmission oil for color and contamination; milky or metallic-looking oil can suggest other mechanical issues that may require professional attention.
  • Keep a maintenance log of all oil changes for future reference.
  • Only use high-quality, recommended oil for both the transmission and the injector system for best results.

Summary

Regularly changing your 2014 Yamaha PW50’s transmission oil is quick and straightforward. Using the right tools, following the manufacturer’s specifications for oil capacity and torque, and paying attention to the injector oil tank will keep your PW50 running smoothly for years.

This guide is proprietary to MotoSport.com and tailored specifically for the 2014 Yamaha PW50 owner.

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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.