How to Change the Oil in a 2013 KTM 50SX: Complete How-To Guide

Shop parts for a 2013 KTM 50SX Dirt Bike.

Keeping your 2013 KTM 50SX running strong demands regular oil changes. This guide, proprietary to MotoSport.com, provides clear steps, essential tools, and critical call-outs unique to this make and model. Follow these steps to keep your clutch healthy and extend the life of your two-stroke mini ripper.

Tools & Materials Needed

  • 13mm socket, with ratchet wrench and extension bar
  • Triangle or side stand (center stands interfere with draining)
  • Oil collection pan
  • Clean shop towels
  • Funnel for ease of refill
  • Replacement gear oil – Use high-quality oil suitable for wet motorcycle clutches (consult your owner's manual for the recommended spec, typically 80W gear oil)
  • Crush washer and O-ring (optional, but replace if deformed or damaged)
  • Torque wrench for precise drain plug tightening
  • Gloves to keep your hands clean

Why Frequent Oil Changes Matter for the 2013 KTM 50SX

  • The KTM 50SX uses a wet clutch system—the same oil lubricates clutch components and the gearbox, resulting in rapid contamination – especially after hard riding or racing.
  • It's recommended to change the gear oil every ride or every 30–60 minutes of ride time to prevent premature clutch wear and costly repairs.
  • Both the 50SX and 50SX Mini use the same procedure, but always verify your correct oil volume in your manual.

Step-by-Step Oil Change Procedure

  1. Warm Up the Bike (Optional, but Recommended)
    • Run the engine for 1–2 minutes to allow the oil to heat up; this helps contaminants flow out more easily when drained.
  2. Secure the Bike
    • Use a triangle or side stand – the center stand will block access to the drain bolt and prevent a full drain.
  3. Remove the Oil Filler Cap
    • Find the oil filler cap on the right side of the engine. Remove it so air can assist drainage.
  4. Position Drain Pan & Remove Drain (Sump) Bolt
    • Locate the gear oil drain bolt under the right side of the engine near the shift shaft. It uses a 13mm head.
    • Place your drain pan directly beneath, then carefully remove the bolt using your socket, extension bar, and wrench.
    • Be cautious – the oil could be hot.
  5. Drain the Oil
    • Allow the oil to fully drain. This process could take several minutes. Check the magnetic drain plug for metal shavings; a normal amount is expected, but excessive debris could mean clutch or gearbox problems.
  6. Inspect and Replace Crush Washer
    • Inspect the crush washer and O-ring on the drain bolt. Replace if crushed, deformed, or worn – this prevents leaks.
  7. Reinstall the Drain Bolt
    • Thread the drain plug back in by hand to avoid cross-threading. Tighten to the manufacturer's recommended torque (check your owner's manual or use 10 Nm (7.4 ft-lb) if not specified).
  8. Refill with Fresh Oil
    • Pour in 200ml (0.2L) of the recommended oil through the filler opening. A funnel helps avoid spills.
  9. Replace the Oil Filler Cap
    • Screw the cap back on securely.
  10. Clean Up and Dispose of Old Oil Properly
    • Wipe away any drips and dispose of used oil at your nearest recycling center.

Important Model-Specific Call-Outs for 2013 KTM 50SX

  • The 2013 KTM 50SX and 50SX Mini do not have an oil filter—frequent oil changes are even more crucial to reduce contamination.
  • Recommended oil volume: approximately 200ml. Overfilling can lead to clutch issues; underfilling risks gearbox damage.
  • If you notice excessive metal shavings on the magnetic drain plug, consider inspecting the clutch system, as this bike is notorious for rapid clutch wear if oil changes are neglected.
  • Remove the oil fill cap first to speed up draining and prevent air locks in the system.
  • Always use a side or triangle stand, not a center stand, for a proper drain.
  • If you're also servicing the air filter, do it after the oil change – this helps avoid introducing dirt into the crankcase or transmission.

Final Inspection

  • Start the bike and let it idle for 30 seconds, then check for leaks at the drain plug and filler cap.
  • After a short ride, check the oil level (even though the 50SX doesn't have a sight glass, monitoring shifting and clutch feel is helpful).
  • Remember: Regular maintenance is your best defense against premature clutch failure and gearbox problems.

This oil change routine, designed for the 2013 KTM 50SX, also applies to closely related 50SX Mini models. With these detailed steps and call-outs, your little KTM will always be ready for the next moto.

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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.