How to Change the Oil in a 2012 Yamaha PW50

Shop parts for a 2012 Yamaha PW50 Dirt Bike.

Keeping your 2012 Yamaha PW50 in top shape means regular maintenance. Changing the transmission oil—the only oil you’ll need to change on this 2-stroke bike—ensures reliable performance and extends the life of the transmission. Here’s an in-depth, step-by-step guide made proprietary for MotoSport.com, giving you everything you need to know, including specific PW50 call-outs.

Tools & Supplies Needed

  • 12 mm socket and ratchet
  • Measuring cup or bottle (marked in milliliters/ounces)
  • Fresh transmission oil (consult manual, typically 10W-30 or 10W-40 motorcycle gear oil)
  • Drain pan
  • New crush washer for the drain bolt (recommended)
  • Funnel
  • Rubber gloves (to keep your hands clean)
  • Rags (for spills and cleaning)

Key PW50 Oil Change Details

  • Oil capacity: 0.30 Liters (300 mL, 0.32 US qt)
  • Transmission oil type: Refer to owner's manual; most use 10W-30 or 10W-40 gear oil
  • Drain bolt torque: 14 N·m (10 lb·ft)
  • Oil change intervals:
    • First month (new bikes)
    • At 6 months after first change
    • Then annually or as needed

Step-by-Step Instructions

  1. Warm Up the Bike
    Start and idle the PW50 for a couple of minutes to warm up the transmission oil. Warm oil drains more easily and removes more contaminants.
  2. Position the Bike
    Put the bike on a level surface and use a stand if available. Place your drain pan directly beneath the transmission oil drain bolt (on the underside of the left crankcase cover).
  3. Remove the Drain Bolt
    Use your 12 mm socket to loosen and remove the drain bolt. Let the old oil drain completely into the pan.
    PW50 Tip: Replace the crush washer on the drain bolt every oil change to ensure a snug, leak-free fit.
  4. Clean & Inspect
    Wipe the drain bolt and its area clean. Inspect the old oil for excessive metal or debris, which can indicate internal damage.
  5. Reinstall the Drain Bolt
    Reinsert the drain bolt with a new crush washer and tighten it to 14 N·m (10 lb·ft). Do not overtighten, as the case is aluminum and can strip.
  6. Measure Fresh Oil
    Using your measuring cup or bottle, fill exactly 300 mL (0.30L) of new transmission oil. Overfilling or underfilling can cause performance issues.
  7. Refill the Transmission
    Insert a funnel into the PW50’s oil fill port. Pour in the fresh oil. Replace and hand-tighten the oil fill cap.
  8. Check for Leaks & Final Inspection
    Start the bike and let it run for a minute to circulate the new oil. Shut it off and inspect the drain bolt area for leaks.
  9. Dispose of Used Oil Properly
    Pour the used oil into an appropriate container and recycle it at a local auto parts store or hazardous waste site.

Model-Specific Call-Outs for 2012 Yamaha PW50

  • This model (and all PW50s) uses a separate 2-stroke injector oil tank for engine lubrication. Only the transmission oil needs changing. Make sure the injector oil tank (located behind the front number plate) stays filled to prevent severe engine damage.
  • Use only the recommended 2-stroke injector oil in the tank, not in the transmission, and ensure the tank cap is installed tightly after filling to avoid leaks or contamination.
  • Always keep the fuel in the “stop” (S) position when not riding to prevent leaks or carb flooding.

Tips for Smooth Oil Changes

  • Keep a few crush washers on hand—using a new one each oil change avoids slow leaks.
  • A disposable measuring cup with a narrow spout minimizes spills when refilling.
  • Store all your used oil for proper disposal; never dump it outdoors or down drains.

Changing the transmission oil on your 2012 Yamaha PW50 is quick, simple, and a vital part of dirt bike maintenance. MotoSport.com has you covered with the tools, oil, and expertise you need for every ride.

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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.