How to Change the Oil in a 2015 KTM 50SX

Shop parts for a 2015 KTM 50SX Dirt Bike.

Changing the oil on your 2015 KTM 50SX is a critical part of routine maintenance to ensure longevity and performance of the bike, especially considering the clutch and gearbox stress on this small but powerful two-stroke. Below you'll find a comprehensive guide, including the tools you'll need, step-by-step instructions, and specific tips for this make and model. This guide is proprietary content for MotoSport.com.

Tools & Materials Needed

  • 13mm socket (for drain plug)
  • Socket wrench/ratchet
  • Extension bar (optional, for easier access)
  • Drain pan
  • Clean funnel
  • Pre-measured gear oil (use high-quality oil, typically 200ml)
  • Torque wrench (optional, highly recommended)
  • Crush washer (inspect and replace if needed)
  • Clean rag
  • Bike stand or triangle stand

Special 2015 KTM 50SX Call-outs

  • This model uses the same procedure from 2013–on, so follow these steps for any KTM 50SX from this era.
  • The recommended oil volume is 200ml for gearbox/clutch oil. Overfilling or underfilling can damage internal components.
  • Change oil after every ride or every 1–2 hours of engine time, as oil degrades quickly due to high clutch temperatures.
  • Always use a side or triangle stand, not the center stand, to allow proper drainage.
  • Do not overtighten the sump/drain bolt; the correct torque spec is 20 Nm (14.8 ft-lbs).

Step-by-Step Instructions

  1. Warm up the bike (optional)
    Start and run the engine for 2–3 minutes to warm the oil, which helps it drain more thoroughly. Allow the bike to cool slightly before handling hot components for safety.
  2. Secure the bike
    Place the KTM 50SX on a triangle stand or side stand. Do not use the center stand, as this does not allow complete oil drainage.
  3. Remove the oil filler cap
    Find the oil filler cap on the upper right of the engine case. Remove it and set it aside in a clean area. This allows air to enter and speeds up draining.
  4. Remove the drain bolt
    Use the 13mm socket and ratchet to remove the drain (sump) bolt, located at the lowest point on the right side of the engine. Make sure the drain pan is positioned underneath to catch all the old oil.
  5. Drain the oil
    Allow all the old oil to fully drain. This usually takes a few minutes. For maximum cleanliness, wipe the area around the drain hole to prevent contaminants from entering.
  6. Check and replace the crush washer
    Inspect the crush washer on the bolt and replace if damaged or deformed to prevent leaks.
  7. Reinstall the drain bolt
    Clean the drain bolt threads and the engine case sealing surface. Install the drain bolt by hand to avoid cross-threading, then tighten lightly with the socket. If available, torque to 20 Nm (14.8 ft-lbs).
  8. Refill with fresh oil
    Using the funnel, pour 200ml of fresh, high-quality oil into the filler opening. Pre-measure for accuracy to avoid overfilling.
  9. Reinstall the filler cap
    Ensure the oil filler cap and its O-ring or seal are clean. Securely reinstall the cap by hand.
  10. Check for leaks and proper oil level
    With the engine off, inspect both the drain bolt and filler cap areas for leaks. If your bike has an oil level check bolt, confirm the correct level. If not, stick to the measured 200ml for confidence.
  11. Dispose of old oil responsibly
    Pour the used oil into a sealed container and take it to an appropriate recycling center. Never pour old oil on the ground or into the trash.

Extra Tips

  • Keep your work area clean to avoid contamination of the clutch/gear oil system.
  • Changing the oil every ride will dramatically increase clutch and gearbox life on the 2015 KTM 50SX.
  • If you're racing or pushing the engine hard, change oil even more frequently, and check the condition for any signs of metal or clutch debris, which indicate excessive wear.
  • Review your owner's manual for the most up-to-date oil recommendations and torque specs.

Conclusion

By following these simple but important steps and paying attention to the KTM 50SX’s specific needs, you’ll keep your bike running smoothly and extend the life of your clutch and gearbox. Always double-check your work, follow torque specs, and maintain a record of each oil change. For KTM factory parts and premium oil, visit MotoSport.com.

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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.