How to Change the Oil in a 2007 KTM 105SX: A Step-by-Step Guide

Shop parts for a 2007 KTM 105SX Dirt Bike.

Regular oil changes are essential maintenance for your 2007 KTM 105SX, ensuring optimal clutch and transmission performance. This step-by-step guide, proprietary to MotoSport.com, will walk you through every detail you need to know when changing the oil on this specific dirt bike model, including critical tips and call-outs unique to the 105SX.

Tools and Supplies Needed

  • Socket wrench set (includes 13mm socket for drain plug and any needed T-handle wrench)
  • Torque wrench (capable of 15 Nm/11.1 ft-lbs for the drain plug or 20 Nm/14.8 ft-lbs if your model uses this specification)
  • Oil catch pan
  • Fresh transmission oil (SAE 10W-30 or the OEM recommended oil such as Motorex 75 per the manual)
  • Funnel
  • New crush washer for drain plug
  • Pliers (optional, for snugging fill cap)
  • Clean white cloth
  • Nitrile gloves (optional, for clean hands)

Steps to Change the Oil on a 2007 KTM 105SX

  • Warm up the engine: Start the bike and let it idle for a few minutes. This ensures the oil drains easily and removes more contaminants. Be careful—warmed-up oil will be hot.
  • Secure the bike on a level surface: Use a stand to ensure the bike is upright and stable.
  • Remove the oil fill cap: This helps oil drain more quickly and smoothly (usually located on the right side engine cover).
    Pro tip: Keep the cap in a clean place to avoid contamination.
  • Place an oil catch pan beneath the drain plug: Locate the drain plug (generally 13mm hex) on the underside or lower side of the engine case.
  • Loosen and remove the oil drain plug:
    • Use your wrench to remove the plug. Be prepared for a quick flow of warm oil.
    • Do not drop the plug into the pan. If there’s a magnetic tip on the plug, clean off any metal shavings–this is common and helps trap engine debris.
    • Inspect and replace the crush washer to ensure a proper seal and prevent leaks.
  • Allow the oil to drain completely: Let the oil drip until the flow stops–a few minutes.
  • Reinstall the drain plug:
    • Hand thread the plug to avoid cross-threading, then use a wrench to lightly snug it.
    • Finish tightening with a torque wrench:
      • Torque spec: 15 Nm (11.1 ft-lbs) for most 2007 105SX models.
      • Some sources recommend 20 Nm (14.8 ft-lbs); check your manual or use the lower value if unsure.
  • Add new oil:
    • Use a funnel for precision and pour in 0.8 liters (800ml) of the correct oil for the 2007 KTM 105SX.
    • Manufacturer spec: Motorex 75 biodegradable hydraulic oil (or equivalent SAE 10W-30 transmission oil).
  • Reinstall the oil fill cap: Secure the cap firmly. KTM recommends using pliers to snug the cap slightly to prevent it loosening from vibration.
  • Wipe down the area: Clean up any spilled oil with a white cloth to prevent dirt attraction and slipping hazards.
  • Start engine and check for leaks: Let the engine idle for a minute, then inspect the drain bolt and fill cap areas for any oil seepage.
  • Dispose of old oil responsibly: Take used oil to a recycling center per local regulations.

Model-Specific Call-Outs for 2007 KTM 105SX

  • Drain plug location and torque: Confirm whether your drain plug is on the bottom or side (occasionally varies by market/year).
  • Oil type and capacity:
    • Oil: Use a high-quality 2-stroke gear oil–Motorex 75 recommended.
    • Quantity: 0.8L (800ml) for 2007 models.
  • Crush washer: Replace the drain bolt washer every time; reusing an old washer increases the risk of leaks.
  • Change Frequency: Although some KTM manuals cite intervals up to 4000 miles, it is best practice for off-road and racing use to change gear oil every 10 engine hours or after every few rides for peak protection.
  • Always check your owner's manual for any updates or if your bike has aftermarket modifications that can affect oil selection or interval.

Additional Recommendations

  • Before cleaning or working near the engine, consider plugging the exhaust pipe to prevent any debris or cleaning solutions from entering.
  • When cleaning, gently rinse the bike with low-pressure water and dry it after oil changes to avoid slipping hazards due to oil drips.

Changing the oil on your 2007 KTM 105SX is a straightforward process that pays off in engine and clutch reliability. By following these steps and KTM’s recommendations, you ensure long-term performance and peace of mind every ride.

Related Shopping Categories

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Shop Oil Fillers and Drain Plugs for a 2007 KTM 105SX 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.