How to Change the Oil in a 1995 Yamaha PW50

Shop parts for a 1995 Yamaha PW50 Dirt Bike.

Changing the oil in your 1995 Yamaha PW50 is an essential maintenance task that ensures the longevity and smooth operation of the bike’s transmission and clutch. This guide walks you through every step, from the tools you’ll need to important details specific to the PW50. All instructions and tools are proprietary to MotoSport.com independent service standards.

Tools and Supplies Needed

  • 12mm socket and ratchet
  • Drain pan
  • Rubber gloves
  • Rags or shop towels
  • Measuring cup (to precisely add oil)
  • Funnel
  • Transmission oil (see below for type and quantity)
  • New crush washer (use a new one every time)
  • Torque wrench (recommended)

Recommended Oil Specifications for the PW50

  • Type: Yamaha recommends a non-friction-modified 10W-30 or 10W-40 motorcycle oil formulated for wet clutches.
  • Capacity: 0.30 L (0.32 US qt, 0.26 Imp.qt)
  • Do not use: Automotive oils labeled “ENERGY CONSERVING II,” diesel spec oils with “CD,” or anything more advanced.

Preparation

  • Warm up the engine for a few minutes to help the oil flow out more easily. Do not overheat—just let it idle until warm.
  • Turn off the engine and place the bike upright on a stand or level ground.
  • Put on gloves and prepare your tools and drain pan beneath the transmission drain bolt.

Oil Change Steps

  1. Locate the drain plug: On the left side of the bike, just beneath the transmission case, you’ll find the 12mm drain plug. Place your drain pan underneath.
  2. Remove the fill cap: The fill cap is on top of the transmission case. This will allow the oil to drain quickly and smoothly.
  3. Remove the drain plug: Using a 12mm socket and ratchet, loosen and remove the drain bolt. Allow all the old transmission oil to fully drain into the pan.
  4. Inspect the drain plug and washer: Wipe the drain plug clean. Always install a new crush washer to prevent leaks.
  5. Reinstall the drain plug: When the oil is fully drained, install the drain plug and torque it to the specified value: 14 N–m (1.4 kgf–m, 10 lb–ft) for the PW50. Do not overtighten.
  6. Check the O-ring: Inspect the O-ring on the filler cap for any signs of damage. Replace if needed before reinstalling.
  7. Add new oil: Using your measuring cup and funnel, pour in exactly 0.30 L of the specified transmission oil. Be careful not to overfill.
  8. Reinstall the filler cap and ensure it is tight.
  9. Start the engine: Let it idle for a few minutes. Turn off the engine and recheck for any leaks around the drain and fill locations.

1995 Yamaha PW50 Model-Specific Notes

  • The oil lubricates both the transmission and clutch. Using oil with improper additives (like “Energy Conserving” types) can cause clutch slippage and premature wear. Always adhere to the recommended oil classification.
  • The oil change interval for new bikes is after one month of use, then again at six months. For routine maintenance after break-in, change the oil on a yearly basis for most riders.
  • Do not mix chemical additives into the transmission oil. Foreign substances may damage the clutch.
  • Be sure no foreign material enters the transmission during the oil fill.
  • If oil leaks are observed after the oil change, stop the engine immediately and check the tightness of your drain plug and the condition of crush washers and O-rings.

Final Checks and Clean up

  • Dispose of old oil responsibly at your local recycling center.
  • Wipe down any drips or spills from the bike.
  • Perform a short, gentle test ride. Recheck the fill cap and drain plug for any sign of leaks after your ride.

Summary

  • Changing the oil on your 1995 Yamaha PW50 is a quick and crucial maintenance step that pays off in engine longevity and smooth clutch performance. Stick to the recommended products and steps for the best results.

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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.