How to Change the Oil in a 2017 KTM 150SX – MotoSport.com Guide

Shop parts for a 2017 KTM 150SX Dirt Bike.

Regular oil changes are essential for maintaining the smooth operation and longevity of your 2017 KTM 150SX. This guide will walk you through every step, highlighting the tools you'll need and providing important model-specific details. Whether you race or ride trails, staying on top of your oil changes helps protect your engine's vital components.

Tools and Supplies Needed

  • 8mm or 13mm socket w/ T-handle or ratchet (verify your drain plug size)
  • Torque wrench (required torque: 20 Nm or 14.8 ft-lbs)
  • Oil drain pan or catch can
  • Shop towels/rags
  • Funnel
  • 0.8 liters (0.85 qt.) of recommended gear oil
  • New crush washer/seal ring for drain plug
  • Pliers (for snugging the fill cap)
  • Gloves (optional, for protection)

Preparation

  • Warm up your engine briefly. This helps the oil drain faster and more completely. Be cautious: oil will be hot.
  • If your 150SX has a skid plate fitted, you may need to remove it for clear access to the drain plug. If you don't want to remove the skid plate every time, consider investing in an oil change funnel device or use a temporary cup to route the oil for cleaner draining (see tips below).

Step-by-Step Oil Change Instructions

  1. Loosen and Remove Oil Fill Cap
    • Locate and unscrew the oil fill cap on the right side of the engine. This allows for smoother draining by preventing vacuum inside the case.
  2. Position Catch Can
    • Place your oil drain pan directly under the drain plug to catch all the used oil.
  3. Remove Drain Plug
    • Use your socket and T-handle or ratchet to loosen and fully remove the magnetic drain plug. Be careful not to drop it into the pan. Allow all gear oil to drain out completely.
    • If you just ran the engine, wait for the oil to cool before handling to avoid burns.
  4. Clean Drain Plug and Inspect Magnet
    • Thoroughly clean any metallic debris from the magnet on your drain plug — a small amount is normal. Excessive shavings may indicate internal wear.
  5. Replace the Crush Washer/Seal Ring
    • Always install a new crush washer or seal ring on the drain plug to prevent leaks. This is a simple step that can save you from drips and potential engine damage.
  6. Reinstall Drain Plug
    • Thread the clean, prepared drain plug back into the case by hand, then use your torque wrench to tighten it to 20 Nm (14.8 ft-lbs). Overtightening can damage threads or the case.
  7. Refill Gear Oil
    • Insert a funnel into the fill port and pour in 0.8 liters (0.85 qt.) of the factory-recommended gear oil. Use high-quality 2-stroke gearbox oil as recommended by KTM; check your manual for specific viscosities suitable for your climate or riding style.
  8. Install and Snug Oil Fill Cap
    • Reinstall the oil fill cap by hand. Use pliers to give it a final snug per KTM's recommendation, ensuring it stays secure during rides.
  9. Clean and Dispose of Old Oil
    • Wipe away any oil drips with shop towels. Dispose of used oil properly at a recycling center.
  10. Double Check
    • Run the engine for a few minutes, stop, and inspect the drain plug and fill cap for leaks. Top off if necessary.

Model-Specific Tips for the 2017 KTM 150SX

  • The drain plug size for this model is M12x1.5 thread.
  • Torque spec for the drain plug is 20 Nm (14.8 ft-lbs). Never exceed this value.
  • The oil quantity is 0.8 liters (0.85 U.S. quarts). Underfilling or overfilling can lead to poor shifting or damage.
  • Crush washer must be replaced at every oil change for a proper seal.
  • Ventilate your workspace or work outdoors — starting the engine in an enclosed space without exhaust extraction can be hazardous.
  • Double check that you use recommended 2-stroke gearbox oil for best clutch and shifting performance. Consult the owner's manual or your local KTM service center if unsure.

Extra Tips for a Clean Oil Change

  • Use an aftermarket oil change funnel or similar device when working with a fitted skid plate to keep things neat.
  • If you ride in muddy or wet conditions often, be sure to clean the area around the drain plug before removal to prevent contaminants from falling into the gearbox.
  • Record your oil changes in a log for easy service tracking.

Conclusion

Changing the oil in your 2017 KTM 150SX does not require advanced tools or skills but consistency and care are crucial. By following these steps and using the correct quantities and torque specifications, you ensure your KTM remains in top condition. Always refer to your owner's manual for updates and proper disposal procedures.

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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.