How to Change the Oil in a 2011 KTM 85SX: A Complete Guide

Shop parts for a 2011 KTM 85SX Dirt Bike.

  • Tools & Supplies Needed:
    • 8mm, 10mm, or 13mm socket or T-handle wrench (verify bolt size for your bike)
    • Torque wrench (for precise tightening)
    • Catch pan or oil drain tray
    • New crush washer/seal ring for drain bolt
    • Funnel
    • Clean shop towels or rags
    • 0.8 liters of full synthetic 15W/50 gear oil (Motorex or Amsoil recommended)
    • Needle-nose pliers (to snug the oil cap)
    • Magnet (if not part of your drain plug)
    • Safety gloves and eye protection

Step-by-Step Instructions

  1. Preparation
    • Warm up the engine for 1-2 minutes to help old oil drain out more effectively, then shut off the bike. Be careful, as the oil and engine parts will be hot.
    • Stand your KTM 85SX upright on a flat, level surface using a bike stand.
  2. Remove the Oil Fill Cap
    • The fill cap is usually on the right side of the engine. Removing it now allows for smoother oil flow during draining.
  3. Locate the Oil Drain Plug
    • The oil drain bolt is positioned under the engine, just beneath the brake pedal on the right side of the bike. Place your catch pan underneath this plug.
      • On the KTM 85SX, the bolt will often have a magnetic tip to collect metal debris.
  4. Remove the Drain Plug and Drain Old Oil
    • Using your socket or T-handle, loosen and remove the drain plug.
    • Allow all old oil to fully drain into the catch pan. Be patient—this may take a few minutes.
    • While draining, inspect the magnetic tip for any metallic debris. Small amounts are normal, but excessive bits could indicate internal wear.
  5. Inspect and Clean Components
    • Thoroughly clean the drain plug, magnet, and the sealing surface of the engine.
    • Always replace the crush washer (seal ring) to ensure a leak-free seal.
  6. Reinstall and Torque the Drain Plug
    • Reinsert the cleaned drain plug with the new washer and finger-tighten.
    • Finish snugging with a torque wrench–KTM recommends 20 Nm (14.8 ft-lbs) of torque for the 2011 85SX.
  7. Add Fresh Oil
    • Insert your funnel into the oil fill port.
    • Pour in 0.8 liters of high-quality full synthetic 15W/50 gear oil. Motorex and Amsoil are favored brands; never use low-quality or non-synthetic oils, as this can lead to premature wear.
  8. Refit and Snug the Filler Cap
    • Screw the oil cap back in by hand, then use a pair of pliers to give it a gentle additional turn. This practice helps prevent oil cap loosening during rides.
  9. Check for Leaks and Oil Level
    • Start the engine for about 20 seconds, then turn it off and inspect under the engine for leaks.
    • Allow the bike to settle, stand it upright again, and remove the oil check bolt or sight plug (located just above the drain bolt). Oil should slowly seep out of the check hole if the level is correct.
    • If needed, add a small amount more oil until it just begins to flow from the check hole, then reinstall the check bolt.
  10. Clean Up
    • Dispose of old oil according to your local regulations–most auto parts stores accept used oil for recycling.
    • Wipe away any oil residue from the engine and frame.

Specific Callouts and Tips for 2011 KTM 85SX Owners

  • The 2011 KTM 85SX requires 15W/50 full synthetic gear oil for best clutch and gearbox performance–a must for durability and gear life.
  • Always replace the crush washer on the drain bolt each time you change oil for a reliable seal.
  • This model features a magnetic drain plug–check and clean metal debris as a regular maintenance check to monitor for excessive engine or gearbox wear.
  • Overfilling can cause seal leaks and sluggish shifting–use the oil check bolt for proper level confirmation.
  • Snug the oil fill cap with pliers, per KTM recommendation, to ensure it does not work loose on rough trails.
  • Allow engine oil to fully drain before adding new oil for the best results and longest gear life.

Final Check

  • Run the engine and check for leaks at all plug points. If leaks are found, stop the engine and retorque the plug.
  • Recheck the oil level after your first short ride to ensure nothing has shifted or leaked.
  • Monitor shifter feel and transmission engagement–KTM recommends regular oil changes (every 10-15 hours for amateur, more often for racing).

For more exclusive tips and guides on KTM and other dirt bikes, always trust MotoSport.com.

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Shop Oil Fillers and Drain Plugs for a 2011 KTM 85SX 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.