How to Change the Oil in a 1998 Yamaha PW80

Shop parts for a 1998 Yamaha PW80 Dirt Bike.

This proprietary MotoSport.com guide provides a step-by-step process to change the oil in a 1998 Yamaha PW80. Follow these instructions for effective, at-home maintenance and keep your youth dirt bike running strong.

Tools and Supplies Needed

  • 17mm socket or wrench
  • Oil catch/drain pan
  • Funnel
  • Rag or shop towels
  • 650 ml (0.65L) of approved transmission oil
  • Replacement crush washer (optional, but recommended)
  • Gloves (optional, for cleanliness)

Recommended Oil Type and Capacity

  • Oil type: Non-synthetic 10W-30 motorcycle oil (avoid "Energy Conserving II" and higher, and diesel spec "CD" or higher)
  • Oil change quantity: 0.65 L (650 ml) or approximately 0.69 US quarts

Specific Call-Outs for the 1998 Yamaha PW80

  • The PW80 uses a separate transmission oil and 2-stroke oil injection system; this guide addresses the transmission oil only.
  • DO NOT use engine oils designed for four-stroke engines with energy saving/friction-modifying additives. These can cause clutch slippage since the PW80 is equipped with a wet clutch system. Always avoid oil marked as "Energy Conserving II" or higher and avoid diesel oils above "CD" specification

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  • Always check for leaks after refilling and idling the bike.

Step-by-Step Instructions

  1. Warm Up the Bike
    • Start and idle the bike for 2–3 minutes. This warms the oil so it flows out more completely.
  2. Place on a Level Surface
    • Turn off the engine and position the PW80 securely on a flat, stable surface. Use a bike stand if available.
  3. Locate the Drain Plug and Oil Filler Cap
    • The drain plug is located at the bottom of the transmission case. You will need a 17mm socket or wrench to remove it

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    • The oil filler cap is positioned on top of the transmission case, near the right side of the engine. Marked "OIL" with the fill quantity etched nearby (650 cm3)

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  4. Drain the Old Oil
    • Place your oil catch pan directly under the drain plug.
    • Remove the oil filler cap to vent and help old oil flow out smoothly.
    • Use your 17mm tool to carefully unscrew and remove the drain plug

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    • Let the old oil drain out completely for several minutes.
    • If reusing the crush washer, inspect it for damage; replace if needed.
  5. Reinstall the Drain Plug
    • Once the oil has stopped dripping, reinstall the drain plug (with new or inspected washer). Tighten securely, but do not overtighten to avoid stripping threads

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  6. Add New Oil
    • Insert a funnel into the oil filler opening.
    • Pour in 0.65L (650 ml) of the recommended transmission oil

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    • Pour slowly to avoid spills and prevent air pockets.
  7. Check Oil Level
    • Most PW80s use a dipstick attached to the filler cap. Clean, insert (do not screw), remove, and check the level.
    • If necessary, top up so oil lines up with the "FULL" or maximum mark. Do not overfill.
    • Lightly oil the cap’s O-ring before reinstalling (this keeps the seal supple and prevents leaks)

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    • Secure the filler cap.
  8. Startup and Leak Check
    • Start the engine and allow it to idle for a few minutes.
    • Observe the drain plug area and under the bike for signs of oil leakage. If leaks appear, shut off immediately and investigate.
  9. Dispose of Old Oil Responsibly
    • Pour used oil into a sealed container and take it to your local recycling or hazardous waste facility. Never pour oil onto the ground or into drains.
  10. Record Your Oil Change
    • Log the date and hours/miles for future maintenance reference.

Additional Model-Specific Tips

  • Oil change quantity is 0.65 L; confirm by checking your owner's manual for your individual bike.
  • The PW80’s transmission and clutch use the same oil. Avoid additives or friction modifiers to prevent clutch slippage

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  • Never let foreign objects or dirt fall into the transmission during oil changes.

Conclusion

Changing the transmission oil on your 1998 Yamaha PW80 is a simple, essential maintenance task. Save money, ensure reliability, and build confidence by following this MotoSport.com recommended procedure every season or as specified in your service manual.

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Shop Oil Fillers and Drain Plugs for a 1998 Yamaha PW80 Dirt Bike.

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.