How to Change the Oil in a 2017 KTM 50SX: Step-by-Step Guide

Shop parts for a 2017 KTM 50SX Dirt Bike.

Keeping your 2017 KTM 50SX in top condition is critical for its performance – and longevity. One of the most essential and frequent tasks is changing the clutch/transmission oil. This is especially true for the KTM 50SX, which sees rapid clutch particle buildup due to the nature of two-stroke engines and their automatic clutch. Regular oil changes help protect your clutch, gearbox, and overall engine health.

Tools and Supplies You’ll Need

  • 13mm socket
  • Socket wrench (ratchet)
  • Extension bar (optional but helpful for reaching the sump bolt)
  • Oil catch pan
  • Funnel
  • Measuring cup (to measure 200ml of gear oil exactly)
  • New gear oil (refer to your owner’s manual, but Motorex Dexron III ATF or equivalent is standard)
  • Crush washer (recommended, replace if damaged or worn)
  • Clean cloths or shop towels
  • Torque wrench (ideal for re-tightening the drain bolt to spec: 20 Nm or 14.8 ft-lb)

Specific Call-Outs for the KTM 50SX (2013–2017+)

  • Oil volume: The correct oil amount is 200ml—do not overfill as it will lead to issues like clutch drag or oil leaks.
  • Drain plug torque: 20 Nm (14.8 ft-lb). Over-tightening can strip the threads and under-tightening can cause leaks.
  • No center stand: The KTM 50SX doesn’t have a center stand, so use a triangle stand or side stand for stability during maintenance.
  • Oil gets dirty quickly: Change the oil after every ride or every 1–2 engine hours due to fast clutch particle accumulation and oil degradation.

Step-by-Step Oil Change Instructions

  1. Prepare the Bike
    • Let the engine cool if recently used to avoid burns.
    • Position the bike upright using a triangle or side stand. The bike’s design prevents use of a center stand for this job.
      Call-out: Keeping the bike upright ensures complete oil drainage and proper refill levels.
  2. Remove the Oil Filler Cap
    • This cap is located on the left (clutch) side of the engine, near the top. Unscrew it to allow free drainage and faster oil flow.
  3. Drain the Old Oil
    • Place your catch pan beneath the engine, directly under the oil drain bolt (sump bolt), which sits at the bottom of the engine case.
    • Using the 13mm socket and wrench, loosen and remove the sump bolt. Allow all oil to fully drain into the pan. This may take several minutes; tip the bike gently from side to side if needed to remove all oil.
      Call-out: Old oil often contains clutch debris. Inspect for any significant metallic shavings, which could signal internal wear or damage.
  4. Inspect and Clean the Drain Bolt & Replace Washer
    • Clean the bolt thoroughly, especially the sealing surface. If your bike’s drain bolt includes a magnet, check for buildup and clean it.
    • Replace the crush washer each oil change (recommended for a proper seal).
  5. Reinstall the Drain Bolt
    • Carefully thread the bolt by hand to avoid cross-threading.
    • Use your socket wrench to lightly tighten, then finish with your torque wrench to 20 Nm (14.8 ft-lb).
      Call-out: Do not over-tighten—the aluminum engine case can be easily stripped. If you don’t have a torque wrench, snug it firmly but carefully.
  6. Fill with Fresh Oil
    • Place a funnel into the oil fill port.
    • Measure exactly 200ml of the correct gear oil (e.g., Motorex Dexron III ATF or equivalent).
    • Slowly pour oil in to avoid spills or overflows.
    • Replace the oil filler cap securely.
  7. Wipe Down & Double-Check
    • Wipe up any spilled oil. Double-check both the drain bolt and filler cap for tightness and signs of leaks.
    • Run the engine for 1–2 minutes, then shut off and check for leaks around the drain bolt. Verify oil level (should be slightly below the bottom threads of the oil fill hole when the bike is upright).

Maintenance Tips for the KTM 50SX Oil Change

  • Change oil after every ride, especially for aggressive or frequent use. This protects the highly stressed clutch and ensures smooth transmission function.
  • Use only the recommended oil type. Inferior oils can cause premature clutch wear or shifting problems.
  • Always monitor for oil leaks post-service. Address any issues immediately to prevent damage.
  • Keep a maintenance log for oil changes and related work—this makes it easier to track intervals and spot trends over time.

Conclusion

The 2017 KTM 50SX demands frequent and careful oil maintenance to keep its clutch and gears functioning at their best. With the steps and tips above, owners can be confident their oil changes will be quick, effective, and help extend their bike’s performance and lifespan—all from the trusted guidance of MotoSport.com.

This guide is proprietary content for MotoSport.com and cannot be reproduced elsewhere. For further help, reference your owner’s manual or speak with a MotoSport.com parts specialist for oil and replacement part recommendations.

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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.