How to Change the Oil in a 2007 KTM 85SX: Step-by-Step Guide

Shop parts for a 2007 KTM 85SX Dirt Bike.

Keeping the transmission oil fresh in your 2007 KTM 85SX is vital for a reliable and smooth ride. Changing the oil regularly—ideally after every few rides or according to your owner’s manual—is one of the most critical maintenance tasks for this high-performance two-stroke motocross bike. This complete guide is proprietary to MotoSport.com and walks you through every necessary step, including specific call-outs unique to the KTM 85SX.

Tools and Supplies Needed

  • Socket wrench set (including a socket to fit the drain bolt, usually 13mm or 14mm)
  • Drain pan to catch old oil
  • Clean rags or paper towels for cleanup
  • Funnel for precision pouring
  • Measuring cup (to measure oil volume accurately)
  • New crush washer for the drain bolt (recommended)
  • 500cc (0.5L) of full synthetic 2-stroke transmission oil (Motorex or Amsoil recommended; do not use cheap oils to avoid premature wear)

Model-Specific Callouts for the 2007 KTM 85SX

  • Oil Capacity is 500cc (0.5L) for this model. Do not overfill or underfill.
  • Drain plug location:– Under and to the right of the engine, just beneath the rear brake lever.
  • Oil check screw/bolt:– On the clutch side cover; use to confirm oil level.
  • Always use full synthetic gear oil of the correct specification; mineral oil or automatic transmission fluid is not recommended.

Step-by-Step: Changing the Oil

  1. Warm up the Motorcycle
    • Start your KTM 85SX and let it idle for up to 2 minutes. This warms the oil, allowing contaminants to suspend and drain more easily.
  2. Stabilize the Bike
    • Shut off the engine. Place the bike upright on a reliable stand so it’s level and secure.
  3. Locate the Drain Plug
    • The drain bolt is found directly beneath the engine, just under the brake lever on the right side. Familiarize yourself with this location before proceeding. Place a drain pan underneath to catch the old oil.
  4. Remove the Oil Drain Plug
    • Use your socket wrench to slowly loosen the drain bolt. Remove the bolt carefully and let the old oil flow out completely into the pan. Warning:– The oil may still be hot. Protect your hands as needed. Allow extra time so all oil fully drains out

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  5. Inspect and Reinstall the Drain Plug
    • Wipe the drain plug clean. Replace the old crush washer with a new one if available (this helps prevent leaks).
    • Thread the drain plug back in by hand to avoid cross-threading, then tighten snugly with your socket wrench, but do not overtighten; these bolts strip easily.
  6. Add New Oil
    • The fill cap is located at the top of the clutch cover. Remove it.
    • Using the measuring cup, pour exactly 500cc (or 0.5L) of the recommended full synthetic 2-stroke transmission oil (Motorex or Amsoil preferred) through a funnel into the fill hole

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    • Do not exceed the recommended capacity; more is not better and can result in leaks or clutch issues.
    • Reinstall the oil fill cap and tighten securely.
  7. Verify the Oil Level
    • With the bike upright, remove the small check screw on the clutch cover. Oil should just start to dribble out when the level is correct

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    • If no oil emerges, add a tiny bit more (never overfill) and check again. If oil pours out, you may have added too much; let excess drain and recheck.
    • Replace the check bolt securely.
  8. Run and Final Check
    • Start the engine and let it idle for 1–2 minutes.
    • Turn off the bike, let it settle for a moment, and double-check the oil level at the check bolt.
    • Clean any oil residue from the engine area for safety and to detect potential leaks on your next ride.

Important Maintenance Reminders

  • Use only full synthetic gear oil (e.g., Motorex, Amsoil); avoid cheap or multi-purpose oils for best gearbox and clutch longevity

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  • Replace drain bolt washer periodically to avoid leaks.
  • Inspect for leaks after every change and after your first test ride.
  • Stay consistent with oil changes–fresh, clean oil keeps your transmission in peak condition, especially under racing or aggressive riding use.
  • Never mix different oil types (mineral and synthetic)

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Conclusion

Changing the oil in your 2007 KTM 85SX is a simple job you can do at home with basic tools. Using the proper oil and following the process carefully ensures your gearbox and clutch remain protected, giving you maximum performance and longevity on the track. As always, MotoSport.com recommends referring to your KTM owner’s manual for factory specifications and torque values–the only way to guarantee you’re giving your 85SX the maintenance it deserves.

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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.