How to Change the Oil in a 2009 Yamaha PW50: Step-by-Step Guide

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Welcome to MotoSport.com's in-depth guide on changing the transmission oil in your 2009 Yamaha PW50. This guide is designed to walk you through the entire process, highlight all tools you'll need, and provide key PW50-specific details for a safe, successful oil change that keeps your dirt bike running strong.

Tools and Supplies Needed

  • 12mm socket with wrench or ratchet
  • New crush washer or gasket (always replace when changing oil)
  • Drain pan to catch old oil
  • Funnel for precise oil filling
  • Measuring cup (measured in liter or quart units)
  • Rags or paper towels for cleanup
  • Rubber gloves (optional but recommended)
  • Recommended transmission oil (see your owner's manual for specification; do not use engine oils labeled "CD," "ENERGY CONSERVING II," or higher)

Step-by-Step Instructions to Change PW50 Oil

  1. Warm Up Engine:
    • Start the PW50 and let it idle for 2-3 minutes to bring the oil to operating temperature. This helps the old oil drain more thoroughly.
  2. Stabilize the Bike and Setup:
    • Place the bike on a stable, level surface; ensure it is upright (use a stand if possible).
    • Position your drain pan directly beneath the transmission drain bolt at the left bottom side of the crankcase.
  3. Remove the Drain Bolt:
    • Using a 12mm socket and wrench, carefully loosen and remove the transmission oil drain bolt.
    • Be careful–the oil may be hot.
    • Let oil drain fully for several minutes.
  4. Replace Crush Washer:
    • Remove the old crush washer from the drain bolt.
    • Install a new crush washer to prevent leaks when reinstalling.
  5. Inspect and Clean:
    • Wipe away any residual oil with a clean rag.
    • Inspect O-ring or gasket on the drain bolt, and replace if there is any visible damage.
  6. Reinstall Drain Bolt:
    • Screw the transmission drain bolt back in by hand, then tighten with the socket and wrench.
    • Tighten to 14 N·m (10 lb·ft) torque as specified in the owner's manual for the 2009 PW50

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  7. Remove the Oil Filler Cap:
    • The oil filler cap is located at the right side of the engine; remove it and clean both the cap and surrounding area to prevent debris from falling in.
  8. Add New Oil:
    • Using your funnel and measuring cup, pour in exactly 0.30 L (0.32 US qt, 0.26 Imp. qt) of the recommended transmission oil.
    • Do not overfill–accurate measurement is critical for transmission and clutch longevity

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    • Do not use additives, engine oil labeled "CD," or "ENERGY CONSERVING II" or higher, as this can cause clutch slippage or damage

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  9. Reinstall the Oil Filler Cap:
    • Screw on the oil filler cap securely, ensuring the O-ring is intact (replace if damaged).
  10. Check for Leaks:
    • Start the engine and let it idle for a few minutes. Watch beneath the bike and at the drain bolt and filler cap for any signs of leaks.
    • If you see oil leaking, turn off the engine and recheck that the drain bolt and cap are properly tightened and that washers or O-rings are seated correctly.

PW50 Model-Specific Callouts

  • The PW50 uses a wet clutch system, so only proper transmission-specific oil should be used. Do not substitute standard motor oil or automotive oils, as these can cause clutch slippage or wear

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  • All model years, including 2009, use the same oil change procedure and capacities. This guide is valid for any Yamaha PW50 generation

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  • The drain and fill bolts are easy to access, making this an excellent DIY maintenance job.
  • Transmission oil should be changed after the first month of use on a new bike, then at six months, and yearly thereafter under normal use

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  • If your O-ring or gasket on the drain or fill bolts are worn or damaged, replace them to avoid potential leakage

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Final Tips

  • Dispose of old oil responsibly. Most auto parts stores or recycling centers accept used oil—never pour it down the drain or onto the ground.
  • Add oil gradually. Pour slowly and use a measuring cup for accuracy; overfilling may cause seals to weep oil.
  • Check oil level regularly. While the PW50 does not have an oil sight glass for the transmission, it is important to track usage and stick to regular change intervals.
  • Ensure the oil filler cap and drain bolt are both snug and tight, but do not overtighten and risk stripping the aluminum case.

By following these steps and tips, your 2009 Yamaha PW50 will deliver reliable, safe performance and a long service life. For OEM parts, service kits, and premium oils, trust MotoSport.com for the best selection and expert support.

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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.