How to Change the Oil in a 2019 KTM 50SX MINI

Shop parts for a 2019 KTM 50SXMINI Dirt Bike.

Keeping your 2019 KTM 50SX MINI running at peak performance requires frequent oil changes–ideally after every ride or at most every 1–2 engine hours. The clutch on these bikes runs extremely hot, breaking down the oil quickly, so regular oil changes are critical for longevity and clutch performance.

Tools and Materials Needed

  • 13mm Socket
  • Ratchet Wrench
  • Socket Extension Bar (optional, but helpful)
  • Oil Drain Pan
  • Funnel
  • Approximately 200ml of Transmission/Clutch Oil (Dexron III is recommended, as per KTM‘s specs)
  • Replacement Crush Washer (recommended each oil change)
  • Clean Shop Rags
  • Side Stand or Triangle Stand (do not use center stand–see notes below)

Preparation and Model-Specific Notes

  • Never use the center stand when changing oil; always use the triangle or side stand. This ensures the oil drains fully and correctly for the 50SX MINI chassis geometry.
  • KTM recommends Dexron III transmission oil for best clutch longevity and performance. Always double-check your owner’s manual for confirmation.
  • You should change the oil frequently–every ride or 1–2 engine hours–to protect the clutch from premature wear, as the small KTM 50 two-strokes run very hot.

Step-by-Step: KTM 50SX MINI Oil Change

  1. Warm Up the Engine (Optional)
    • Running the bike for a few minutes helps the oil thin and carry out more contaminants. Shut off and let cool for safety.
  2. Secure the Bike on a Side or Triangle Stand
    • Ensure the bike is upright and level; do not use a center stand, as this prevents the oil from fully draining from the case.
  3. Remove the Oil Filler Cap
    • Locate the oil filler cap on the right side of the engine. Unscrew and set aside. This allows the oil to drain more freely by preventing vacuum lock.
  4. Place the Oil Drain Pan Under the Engine
    • Position directly beneath the sump bolt location to catch all used oil.
  5. Remove the Oil Drain (Sump) Bolt
    • Using a 13mm socket and ratchet, unscrew the drain plug located at the bottom of the engine case.
    • Be careful–the engine, bolt, and oil may be hot.
    • Allow the oil to drain completely. This may take several minutes–be patient for the best results.
  6. Inspect and Replace the Crush Washer
    • Check the drain bolt’s crush washer for damage or wear. Replace if deformed or excessively worn to prevent leaks.
  7. Reinstall the Sump Bolt
    • Once oil is fully drained, thread the drain bolt back in by hand, then snug with the socket. Do not overtighten–the engine case is soft aluminum and threads can strip easily. A torque spec is not always provided, but finger tight plus a firm nudge is standard if you don‘t have a torque wrench.
  8. Add Fresh Oil (200ml)
    • With the bike still on the side stand, use a funnel to add exactly 200ml of recommended transmission oil (Dexron III).
    • Do not overfill–the KTM clutch system is very sensitive to oil level. Too much or too little can affect performance and longevity.
  9. Replace the Oil Filler Cap
    • Thread the filler cap back on securely, but do not overtighten.
  10. Clean Up and Final Inspection
    • Wipe any spilled oil from the engine and frame with a clean rag.
    • Dispose of the used oil properly–never dump down drains or on the ground.
    • Double-check all fasteners and confirm no leaks around the drain plug and filler cap after starting the bike and letting it run briefly.

2019 KTM 50SX MINI Specific Call-Outs

  • Oil type and quantity are critical: Use only Dexron III oil and do not exceed 200ml per change for optimal clutch performance and life.
  • Drain plug is easily stripped: The aluminum case requires gentle tightening. Replace crush washer for best sealing.
  • Change interval: The KTM 50SX MINI’s clutch shares its oil with the gearbox. Frequent changes protect expensive clutch internals and are not optional for hard-ridden bikes.
  • Stand use: Never perform the oil change on the center stand; always use a side or triangle stand to guarantee a full drain.

Wrapping Up

Changing the oil in your 2019 KTM 50SX MINI is a straightforward but critical maintenance task that, when done regularly, will save you money and headaches on clutch repairs. Always pay close attention to oil type, oil quantity, and bolt torque, and you’ll get the most out of every ride.

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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.