How to Change the Transmission Oil in a 2019 Yamaha PW50

Shop parts for a 2019 Yamaha PW50 Dirt Bike.

This guide is proprietary to MotoSport.com and walks you through a robust, step-by-step process for changing the transmission oil in your 2019 Yamaha PW50. Regular oil changes promote reliable performance and extend the lifespan of your PW50's transmission.

Tools and Supplies Needed

  • 12mm socket and ratchet – for removing and reinstalling the drain bolt
  • Oil drain pan – to catch old transmission oil
  • Funnel – for clean oil filling
  • Measuring cup – to ensure the correct amount of oil is added (0.30L or 0.32 US qt)
  • Rags or shop towels – for cleanup
  • New crush washer (gasket) – replace every oil change
  • Quality 10W-30 transmission oil (or as specified in your manual; do not use automotive, energy-conserving, CD-spec, or higher oil)
  • Gloves – to keep your hands clean
  • Torque wrench – for precise tightening of the drain bolt (14 Nm/10 lb-ft)

Preparation

  • Start your bike and let it warm up for a minute or two. Warm oil drains faster and brings more contaminants out.
  • Turn the engine off and ensure the bike is upright and stable, ideally on a stand.
  • Place the oil drain pan directly under the transmission drain bolt.

Oil Change Steps

  • Remove the Transmission Oil Drain Bolt:
    • Using your 12mm socket and ratchet, loosen and remove the drain bolt located underneath the engine on the left side.
    • Be careful as the oil may be hot. Allow all the oil to fully drain into your pan.
    • Remove the oil filler cap on the side cover to speed up the draining process and inspect the cap's O-ring for any signs of wear or damage, replacing if necessary.
  • Replace the Crush Washer:
    • Remove the old crush washer from the drain bolt and replace it with a new one every oil change. This helps prevent leaks after reinstallation.
  • Reinstall the Drain Bolt:
    • Once the oil is done draining, clean the drain bolt, check threads for damage, and thread it back in with the new washer.
    • Using a torque wrench, tighten the bolt to 14 Nm (10 lb-ft) as recommended by Yamaha.
  • Add New Transmission Oil:
    • With the bike upright, use a funnel to slowly pour 0.30 L (300 ml or 0.32 US qt) of the correct transmission oil into the fill hole.
    • Do not overfill—overfilling can cause excess pressure and leaks. Use your measuring cup for accuracy.
    • Never use oil with “Energy Conserving II” or higher, CD or higher diesel spec, or any additives. Use only the oil type specified in the Yamaha manual to avoid clutch slippage and protect your transmission.
  • Reinstall the Filler Cap:
    • Wipe any oil residue from the area and reinstall the oil filler cap securely. Make sure the O-ring is intact and replace if necessary.
  • Check for Leaks:
    • Start the engine and let it idle for several minutes, watching the transmission area for signs of oil seepage.
    • If you spot a leak, immediately shut off the engine and check the tightness of the drain bolt and condition of the washer and O-ring.

PW50 Owner‘s Tips and Model-Specific Call-Outs

  • The 2019 Yamaha PW50 uses a basic air-cooled engine with an integrated transmission. All PW50 model years (including 2019) use the same transmission oil procedure and torque specs. This procedure applies to all model years as there have been no significant design changes affecting oil change steps in these bikes.
  • Yamaha recommends changing the transmission oil after the first month of use, again at six months, and then annually. More frequent changes are recommended if you ride in harsh conditions or race your bike.
  • Avoid using car engine oil or any oil marked “Energy Conserving II” as it can cause clutch slippage and premature wear.
  • Always use a new crush washer to prevent slow leaks on the drain bolt. Crush washers are single-use by design.
  • Ensure the bike is stable and upright when refilling to get an accurate oil level.

Safety and Environment

  • Dispose of used oil responsibly at a designated recycling center. Never pour used oil down the drain or on the ground.
  • Keep oil off brake components, tires, and painted surfaces to prevent hazards or damage.

Transmission Oil Specifications for the 2019 Yamaha PW50

  • Oil change quantity: 0.30 L (0.32 US qt)
  • Drain bolt torque: 14 Nm (10 lb-ft)
  • Recommended oil: As specified in your Yamaha manual, typically a quality 10W-30, free from additives or “energy conserving” labels

By following this MotoSport.com proprietary guide, you can extend the life of your 2019 Yamaha PW50 and enjoy reliable rides for years to come. Always reference your Yamaha owner’s manual for any additional model-specific recommendations or updates.

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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.