How to Change the Oil in a 2014 KTM 125SX: The Complete Guide

Shop parts for a 2014 KTM 125SX Dirt Bike.

Changing the oil in your 2014 KTM 125SX is an essential maintenance task that ensures the longevity and peak performance of your dirt bike. Oil changes keep your engine's internal components lubricated, reduce friction, and prevent wear from metal debris. This detailed guide, proprietary to MotoSport.com, walks you through every step, covers the tools you'll need, and points out important model-specific tips for the 2014 KTM 125SX.

Tools and Supplies Needed

  • Socket set (with T-handles and extension bar)
  • 10mm socket (for drain plug)
  • Torque wrench (capable of measuring 20 Nm/14.8 ft-lb)
  • Drain pan (to catch old oil)
  • Funnel (for pouring new oil)
  • Gloves (optional, for cleanliness)
  • New crush washer (recommended to prevent leaks)
  • Magnetic drain plug (already on bike, clean thoroughly)
  • High-quality 2-stroke gear/transmission oil (KTM recommends Motorex products, see below for capacity)
  • Pliers (to snug the fill cap)
  • Clean rags or shop towels

Oil Specifications and Capacity for the 2014 KTM 125SX

  • Recommended Oil: Fully synthetic 2-stroke gear oil. KTM recommends Motorex Cross Power 2T.
  • Oil Capacity: 0.8 liters (approximately 0.84 quarts)

Step-by-Step: Changing the Oil on a 2014 KTM 125SX

  1. Warm Up the Engine
    • Start your dirt bike and let it idle for 2-3 minutes. This warms up the oil, allowing it to drain out more completely and carry away debris.
    • Caution: Oil and engine parts will be hot after running.
  2. Remove the Oil Fill Cap
    • Turn the fill cap counterclockwise and remove it. This allows air in and helps the oil drain out smoothly.
    • Set the cap aside somewhere clean.
  3. Position Your Drain Pan
    • Place a catch pan directly underneath the engine's drain plug. Have shop towels ready for spills.
  4. Remove the Drain Plug
    • Use your 10mm socket (with a T-handle or ratchet) to loosen and remove the drain plug.
    • Take care not to drop the plug into the oil pan. The drain plug on the 125SX is magnetic–it captures metal particles; debris is normal.
    • Allow the oil to fully drain. You may need to tilt the bike upright briefly to help all oil exit.
  5. Clean and Inspect the Drain Plug
    • Wipe off any metal particles from the magnetic tip of the drain plug. Small amounts are normal.
    • Replace the old crush washer with a new one to prevent leaks.
  6. Reinstall the Drain Plug
    • Screw the plug back into the engine case and hand-tighten with your T-handle or ratchet.
    • Using your torque wrench, tighten the plug to 20 Nm (14.8 ft-lb).
  7. Refill with New Oil
    • Place a funnel into the oil fill hole.
    • Pour in 0.8 liters of the recommended 2-stroke gear oil. Pour slowly to avoid overflow

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    • You do not need to fill an entire quart; watch for oil to start "weeping" from the check hole (if present) and allow any excess to drain.
  8. Install the Oil Fill Cap
    • Replace the oil fill cap and use pliers to snug it down (per KTM's recommendation). Do not overtighten

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  9. Check for Leaks
    • Start the bike and let it idle for a few minutes, then shut it off.
    • Inspect the drain plug and fill cap area for fresh oil indicating a leak.
  10. Dispose of Old Oil Properly
    • Seal the used oil in a container and take it to a recycling center or auto parts store that accepts used oil.

2014 KTM 125SX Model-Specific Call-Outs

  • The drain plug on the 125SX is magnetic. Seeing some metal shavings on the magnet is normal for 2-strokes, but if you see large metal fragments, consult a mechanic

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  • Crush washer replacement is important on this model—failure to do so can result in leaks.
  • The recommended oil type is explicitly called out by KTM: Motorex Cross Power 2T, or any high-quality, fully synthetic 2-stroke gear oil

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  • Tighten the drain plug to 20 Nm (14.8 ft-lb) with a torque wrench, not just hand tight

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  • Oil capacity is 0.8 liters. Do not overfill. Too much oil can lead to clutch and shifting issues

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Final Tips

  • Always use high-quality oil. It makes a real difference in shifting and long-term protection.
  • If you ride hard or in harsh conditions, change your oil more frequently than the factory recommendation.
  • Take care when removing and tightening engine bolts—over-torquing can strip aluminum threads.
  • If in doubt, refer to your full owner's manual—pages regarding oil changes are typically found around section 17–18 for KTM manuals

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  • Regular oil changes keep your 2014 KTM 125SX performing at its best, session after session.

If you need high-quality Motorex oil, crush washers, or specialty tools, visit MotoSport.com for genuine KTM parts and expert help. Safe riding.

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Shop Oil Fillers and Drain Plugs for a 2014 KTM 125SX Dirt Bike.

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.