How to Change the Oil in a 2017 Yamaha YZ250X – Step-by-Step Guide

Shop parts for a 2017 Yamaha YZ250X Dirt Bike.

Changing the gearbox oil in your 2017 Yamaha YZ250X is essential maintenance for performance and longevity. Though the YZ250X uses premix fuel for engine lubrication, you need to change its transmission (gearbox) oil regularly to keep the clutch and gears protected. Here’s the ultimate MotoSport.com guide to doing it right.

Tools and Materials Needed

  • Socket wrench with 12 mm socket
  • Drain pan
  • Funnel
  • Rag/Shop towels
  • New crush washer (recommended)
  • Measuring cup or graduated oil jug
  • Replacement oil (YAMALUBE 2-stroke transmission oil or equivalent, per your manual’s spec)
  • Rubber gloves (optional)

Model-Specific Callouts for the 2017 YZ250X

  • The 2017 YZ250X uses premix lubrication for the engine; oil changes apply only to the gearbox oil, not the crankcase oil. No oil filter needs to be replaced.
  • Recommended oil capacity is typically 750 mL (0.80 US qt), but always check your specific owner’s manual for confirmation.
  • The gearbox drain bolt is located on the underside of the engine.

Step-by-Step Instructions

  1. Warm Up the Engine
    • Start your YZ250X and let it idle for a few minutes. This heats up the oil, allowing it to drain more completely.
    • Turn off the engine and let the bike cool for a minute so it’s safe to work on.
  2. Secure the Bike
    • Place the bike on a stand so it sits upright and is stable, giving you easy access to the drain bolt under the engine.
  3. Drain the Old Gearbox Oil
    • Place your drain pan directly under the engine’s drain bolt.
    • Using a socket wrench with a 12 mm socket, remove the gearbox oil drain bolt from under the engine.
    • Remove the oil filler cap (on the side cover) to let air in—this will help the oil drain more quickly and completely.
    • Allow all the old oil to drain. Inspect the oil for metallic particles, which may indicate internal wear.
  4. Replace the Crush Washer (Recommended)
    • Remove the old crush washer from the drain bolt. Replace it with a new one to ensure a proper seal and prevent leaks.
  5. Reinstall the Drain Bolt
    • Clean threads on both the bolt and the engine case with a rag.
    • Hand-tighten the drain bolt, then torque it to spec according to your Yamaha service manual (typically around 17 ft-lb, but confirm for your model).
  6. Add New Gearbox Oil
    • Using a measuring cup or graduated jug, measure out 750 mL (0.80 US qt) of the recommended Yamalube or equivalent 2-stroke transmission oil.
    • Insert a clean funnel into the filler neck and pour in the new oil.
  7. Check Oil Level
    • Remove the funnel and re-install the filler cap securely.
    • Some models have an oil level check bolt; if yours does, remove it. Oil should just trickle from the check hole when the bike is level, indicating the correct oil level.
  8. Inspect for Leaks
    • Start the engine again, let it idle for a minute, and check around the drain bolt and filler cap for any signs of oil leaks.
  9. Dispose of Old Oil Properly
    • Pour the old oil into a sealed container and take it to your local recycling center. Never pour used oil down a drain or onto the ground.

Expert Tips for the 2017 Yamaha YZ250X

  • Never overfill or underfill the gearbox. Too much oil can cause foaming and clutch drag; too little can accelerate wear.
  • If you ride in wet, sandy, or muddy conditions, change oil more often than the standard maintenance interval.
  • Always use the oil grade recommended by Yamaha for optimum clutch performance and protection.

Common Questions

  • Can I use any oil?
    Use only high-quality two-stroke transmission oil that meets Yamaha’s recommendations. Automotive or engine oil is not designed for the clutch and gears in a dirt bike transmission.
  • Is there an oil filter?
    No. The YZ250X transmission uses contained lubricant with no replaceable filter. Simply drain and refill as directed above.
  • How often should I change the gearbox oil?
    For race or aggressive riding: every 5-10 hours. For casual trail use: every 15-20 hours or at least once every season.

For more model-specific tips, technical parts, or performance upgrades for your Yamaha YZ250X, trust MotoSport.com for professional advice and the best selection of OEM and aftermarket dirt bike parts.

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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.