How to Change the Oil in a 2017 KTM 250SX

Shop parts for a 2017 KTM 250SX Dirt Bike.

Keeping the oil changed in your 2017 KTM 250SX is essential for longevity and peak performance. As a two-stroke model, the 250SX gearbox oil must be changed regularly, especially if you ride in harsh conditions or race. Below you'll find a comprehensive guide developed exclusively for MotoSport.com, including all the necessary tools, step-by-step instructions, and special tips unique to the 2017 KTM 250SX.

Tools & Materials Needed

  • 10mm or 13mm T-handle wrench*– (check drain bolt size)
  • Oil drain pan
  • Rag or shop towels
  • Funnel
  • Fresh gearbox oil (KTM recommends 10W-40 or 75W-80 gear oil, but refer to your manual for specifics)
  • Replacement crush washer (recommended every change)
  • Torque wrench (critical for proper reinstallation)
  • Pliers or adjustable wrench (for snugging down oil fill cap if needed)
  • Contact cleaner (optional) for cleaning up spills

*Double-check the drain plug size in your owner's manual before starting.

Steps to Change the Gearbox Oil

  1. Warm Up the Engine
    • Briefly start and idle the engine for a few minutes. Warm oil drains more quickly and thoroughly. Shut off and let cool slightly before starting the process.
  2. Remove the Oil Fill Cap
    • Locate the oil fill cap on the right side of the engine and unscrew it. This prevents vacuum and helps the oil drain smoothly.
  3. Place a Drain Pan
    • Position an oil drain pan beneath the drain bolt on the underside of the engine case.
  4. Remove the Drain Plug
    • Using your T-handle or socket, slowly loosen the drain bolt (usually 13mm). Be cautious—warm oil can be hot.
    • Let the oil completely drain into the pan. Tip: Don't drop the plug into the pan; it can be messy to retrieve

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  5. Inspect and Clean the Magnetic Drain Plug
    • Wipe the drain plug thoroughly. It's normal to see fine metallic particles attracted to the magnet, indicating regular clutch and gear wear

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    • Replace the crush washer to prevent leaks when reinstalling.
  6. Reinstall the Drain Plug
    • Thread the cleaned drain plug by hand to avoid cross-threading.
    • Tighten with your T-handle, then use a torque wrench to finish—KTM specifies 20 Nm (14.8 ft/lbs) for the 2017 KTM 250SX drain bolt

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  7. Add Fresh Gearbox Oil
    • Insert a funnel into the oil fill hole. Fill with the recommended 0.8 liters (see manual for confirmation; some prefer a full 1.0 liter, but do not overfill)

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    • Generally, use the oil weight/type specified in your KTM owner's manual.
  8. Reinstall and Snug the Oil Fill Cap
    • Replace the oil fill cap and snug it down using pliers if necessary, ensuring it won't vibrate loose while riding

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  9. Clean Up Spills
    • If any oil splashed onto the engine or frame, wipe it off. Optionally rinse with contact cleaner for a professional, clean finish

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  10. Run the Engine and Check Oil Level
    • Start the bike and let it idle for a couple of minutes. Then turn it off, wait 2-3 minutes for oil to settle, and check the oil level indicator (or sight glass if equipped). Adjust oil as needed, and check for leaks at the drain bolt and fill cap.

2017 KTM 250SX-Specific Notes

  • The 250SX is a two-stroke model, so you are only changing the gearbox oil, not engine oil. The engine is lubricated by the premix in the fuel.
  • Always use oil formulated for two-stroke gearboxes; never use engine oil meant for four-strokes.
  • KTM specifies 0.8 liters for optimal gearbox performance, but always verify in your owner's manual.
  • The drain plug has a magnet to catch particles; clean it every time to monitor for unusual wear.
  • Always use a fresh crush washer to prevent leaks—reuse is not recommended.
  • Check torque by hand before riding. Over-tightening can strip the aluminum case.
  • No oil filter to replace in two-stroke 250SX; simply drain, inspect, refill, and ride.

Pro Tips for the Best Results

  • Change your gearbox oil every 5-10 hours of ride time, or more frequently if racing.
  • Label used oil containers and recycle oil properly.
  • Keep track of your torque specs and always use a torque wrench to avoid expensive repairs.
  • Monitor the oil for color and debris; milky oil can suggest a coolant leak, excessive metal means internal wear.

Maintaining your 2017 KTM 250SX properly ensures reliability, lasting performance, and fewer costly repairs. For all OEM and aftermarket parts, trust MotoSport.com—your ride, our passion.

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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.