How to Change the Oil in a 2007 Yamaha PW50 — A Complete MotoSport.com Guide

Shop parts for a 2007 Yamaha PW50 Dirt Bike.

Maintaining your 2007 Yamaha PW50 ensures smooth operation and a long-lasting engine, especially for young riders starting their dirt bike journey. While this little bike is known for its simplicity and durability, it requires regular transmission oil changes to keep the internal gears running smoothly. Below, you'll find a step-by-step, model-specific guide to changing the transmission oil on your PW50, including the tools you need, key precautions, and model-specific tips every owner should know.

Tools & Supplies Needed

  • 12mm socket or wrench (for drain bolt)
  • Torque wrench (for accurate tightening of drain bolt)
  • Drain pan (for used oil)
  • Funnel (to avoid spills when refilling oil)
  • Measuring cup (to measure oil quantity precisely)
  • Replacement crush washer/gasket (always use a new one)
  • Shop rags/paper towels (for cleanup)
  • Nitrile or latex gloves (to protect your hands)
  • Transmission oil — Yamaha recommends a specific oil, typically Yamalube or a comparable quality oil. Capacity: 0.30 L (0.32 US qt).

Step-by-Step Oil Change Process

  • Warm Up the Bike: Start and let the engine run for a few minutes. Warming the transmission makes oil flow easier, helping contaminants to drain out with the old oil .
  • Stabilize the PW50: Place the bike on its center stand to keep it upright and stable .
  • Prepare the Work Area: Put a drain pan under the transmission area to catch the old oil .
  • Remove the Oil Filler Cap: This helps the oil drain smoothly by allowing air in as oil flows out. The filler cap is on the right side of the engine.
  • Remove the Transmission Drain Bolt and Crush Washer: Use your 12mm socket to loosen and remove the bolt and washer at the bottom of the transmission case. Allow the oil to fully drain . Dispose of old oil safely and follow local regulations.
  • Inspect and Replace the Washer: Always install a new crush washer or gasket before reinstalling the drain bolt. This ensures a leak-free seal.
  • Reinstall and Torque the Drain Bolt: Once drained, reinstall the bolt with the new washer. Tighten it to 14 Nm (10 ft-lb) to avoid overtightening or stripping threads .
  • Refill the Transmission Oil: Using a funnel, pour in 0.30 L (0.32 US qt) of recommended transmission oil through the filler port . Use a measuring cup to ensure accuracy—too much or too little oil can cause issues.
  • Install and Tighten the Oil Filler Cap: Hand-tighten the cap securely.
  • Check for Leaks: Start the engine, let it idle for a minute, and inspect the drain bolt and surrounding area for any signs of leakage.
  • Clean Up: Wipe up any spilled oil and properly recycle the used oil.

Maintenance Tips & Specific Call-Outs for the 2007 Yamaha PW50

  • Service Interval: Yamaha recommends changing the transmission oil after the first month of use (if new) and then every six months. For most owners with a used PW50, an annual change is sufficient unless the bike is used in particularly harsh conditions or ridden frequently .
  • Oil Leaks: Always inspect the area around the drain bolt and filler cap for oil leaks before each ride; leaks can indicate a worn washer or overtightened bolt .
  • Type of Oil: For best results, use Yamalube or a high-quality ATF/gear oil suitable for small 2-stroke transmissions. Avoid generic automotive engine oils as they are not formulated for the PW50 gearbox .
  • Drain Bolt Location: On the 2007 PW50, the transmission drain bolt is easily accessible on the bottom of the right side engine case, making this job simple for any skill level.
  • New Crush Washer Required: Every oil change should include a new crush washer/gasket on the drain bolt to prevent future leaks .
  • Overfilling Warnings: Do not overfill the transmission. Accurate measurement (0.30 L) is crucial to maintain proper function and avoid excess pressure or leaks .
  • No Engine Oil Required: The PW50 is a 2-stroke and uses pre-mixed fuel or injector oil for the main engine. The process described here is for the transmission oil only.

Final Inspection & Next Steps

  • Double-check tightness of the filler cap and any visible bolts.
  • Monitor oil level and inspect for leaks after the first ride post-change.
  • Keep a log of your maintenance to ensure the PW50 always receives timely service.

With just a handful of basic tools and a few minutes, changing the transmission oil on your 2007 Yamaha PW50 can be a simple and rewarding DIY task—ensuring years of reliable, worry-free rides. For parts, premium fluids, and service tips, always count on MotoSport.com to keep you and your bike in winning form.

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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.