How to Change the Oil in a 2019 KTM 150SX

Shop parts for a 2019 KTM 150SX Dirt Bike.

Changing the engine oil on a 2019 KTM 150SX is a straightforward maintenance task that, when done regularly, keeps your two-stroke dirt bike running smoothly and helps prolong engine life. This proprietary MotoSport.com guide walks you through the process step by step, specifies the tools you'll need, and highlights any model-specific call-outs for the 2019 KTM 150SX.

Tools and Supplies Needed

  • High-quality 2-stroke transmission oil (KTM recommends Motorex Cross Power 2T 10W-50, but always check your manual or with your dealer for the latest specification.)
  • T-handle socket wrench
  • Torque wrench
  • Oil drain pan
  • Funnel
  • New crush washer for the drain plug
  • Shop rags or paper towels

Step-by-Step Oil Change Procedure

  1. Warm Up the Engine: Start your 2019 KTM 150SX and let it idle for a few minutes. This helps the oil drain more completely. Be cautious—hot oil can cause burns.
  2. Place the Bike on a Stand: Put your bike on a stand to ensure it's level, which allows for a complete oil drain.
  3. Remove the Oil Fill Cap: Locate the oil fill cap on the right side of the engine. Remove it to allow for better oil draining and to prevent a vacuum from forming inside the case.
  4. Loosen the Drain Plug: Place your drain pan beneath the engine. Using a T-handle, loosen the drain plug (located on the underside of the engine). Allow the oil to drain completely. This may take several minutes.
  5. Inspect the Drain Plug: After removing the drain plug, check the magnetic end for metal particles. Some small debris is normal, but large chunks or excessive shavings could indicate engine wear and should be evaluated by a professional.
  6. Replace the Crush Washer: Always install a new crush washer on the drain plug before reinstalling it. This prevents leaks and ensures a proper seal.
  7. Reinstall the Drain Plug: Once all oil has drained, reinsert the drain plug. Lightly tighten it by hand, then use a torque wrench to tighten it to the manufacturer's specification (20 Newton-meters, or 14.8 foot-pounds). Over-tightening can damage the engine case.
  8. Refill with Fresh Oil: Using a funnel, pour in approximately 0.8 liters (800 ml) of the recommended 2-stroke transmission oil. The 2019 KTM 150SX requires this specific amount–do not overfill, as excess oil can cause clutch slippage and other issues.
  9. Reinstall the Oil Fill Cap: Securely reinstall the oil fill cap. You can use a pair of pliers to gently tighten it, as recommended by KTM, to prevent it from loosening during rides.
  10. Check for Leaks: Start the engine and let it idle for a minute. Turn it off and check the drain plug and fill cap for any leaks.

Model-Specific Call-Outs for the 2019 KTM 150SX

  • Oil Type and Volume: Always use 2-stroke transmission oil, not engine oil, as the 150SX uses a shared oil reservoir for the transmission and clutch. The correct volume is 0.8 liters after a complete drain–overfilling can lead to clutch problems and excess oil consumption.
  • Drain Plug Torque: The drain plug must be torqued to 20 Newton-meters (14.8 foot-pounds) to avoid stripping the threads in the engine case. Never use excessive force.
  • Fill Cap Security: After reinstalling the oil fill cap, KTM recommends using pliers to gently snug it down, as it can loosen during vibration if not properly secured.
  • No Oil Filter: The 2019 KTM 150SX does not have a replaceable oil filter—its transmission is lubricated by oil bath only. No additional filter replacement is needed during an oil change.
  • Check for Debris: Inspect the magnetic drain plug for metal particles each time you change the oil. Excessive debris could indicate internal wear and should be addressed by a professional.

Final Tips

  • Dispose of Used Oil Responsibly: Take your used oil to a certified recycling center–do not pour it down the drain or into the environment.
  • Service Intervals: KTM recommends changing the transmission oil every 15 hours of operation or after every race, whichever comes first. Adjust this interval based on your riding conditions–more frequent changes may be needed for harsh or competitive use.
  • Keep Records: Document your oil changes and any observations about oil condition or debris. This helps track engine health over time.

Conclusion

Changing the oil on your 2019 KTM 150SX is a simple but vital part of routine maintenance. By following these steps, using the recommended tools and oil, and paying attention to the model-specific call-outs, you'll help ensure your bike delivers reliable performance and a long engine life. For more information or assistance, consult your owner's manual or contact an authorized KTM dealer.

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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.