How to Change the Oil in a 2017 KTM 85SX: Step-by-Step Guide

Shop parts for a 2017 KTM 85SX Dirt Bike.

Maintaining your 2017 KTM 85SX properly ensures optimal performance and a longer engine life. One of the most critical tasks is changing the gear oil at regular intervals. This in-depth guide breaks down the oil change process for your 85SX, with callouts specific to the 2017 model, and is presented exclusively by MotoSport.com.

Tools and Materials Required

  • 13mm socket or wrench (for drain plug)
  • 8mm socket (for oil level/check bolt on side of engine)
  • Oil catch pan
  • Clean funnel
  • Measuring cup (recommended for accurate refilling)
  • Fresh gear oil (see owner's manual, typically Motorex or high-quality synthetic, 500ml is standard)
  • Torque wrench (for proper torque on drain plug: 20 Nm – 14.8 ft-lb)
  • Clean rags or shop towels
  • New crush washer (recommended to replace every oil change)
  • Latex/nitrile gloves (optional for cleanliness)

2017 KTM 85SX Oil Change Steps

  • Warm up the engine
    • Start the bike and let it run for a few minutes. Warm oil drains more completely and carries away more contaminants.
  • Remove the drain plug
    • Position the catch pan beneath the gearcase. The oil drain bolt is located directly underneath the engine, typically under the brake lever. Use the 13mm socket or wrench to loosen and remove the drain plug.
      Watch out: The oil will be hot after warming up the bike. Avoid burns and be careful not to drop the drain plug in the oil pan.
  • Drain the oil
    • Allow the oil to completely drain out. This may take a few minutes. Let gravity do the work until no more oil drips out.
  • Inspect and clean the drain plug
    • The drain plug is magnetic—inspect for any metal debris and wipe it clean. A small amount of metallic paste is normal, but excessive shavings could indicate internal wear.
      Tip: Replace the copper crush washer each time to prevent leaks.
  • Reinstall the drain plug
    • Thread the plug—and a new crush washer if available—back into the case by hand. Tighten with a torque wrench to 20 Nm (14.8 ft-lb) for proper sealing and to avoid stripping the threads.
  • Refill with correct oil and amount
    • Locate the oil fill cap on the right side of the engine. Remove it.
    • For the 2017 KTM 85SX, use a high-quality synthetic gear oil (Motorex or equivalent) and pour in 500ml (0.5L). Use a funnel for a clean fill.
  • Check the oil level
    • Remove the oil check bolt (8mm) located on the engine's right-side case. Oil should slowly dribble from this hole if the bike is level; this confirms the oil level is correct.
      If no oil comes out, add small amounts until it does. If it pours out, let it drain down to a slow trickle before reinstalling the bolt.
  • Reinstall the oil check bolt and fill cap
    • Fit both bolts snugly. KTM recommends ensuring the fill cap is secure to prevent loosening during use.
  • Start the bike and check for leaks
    • Start the engine and let it idle briefly. Inspect areas around the drain and fill bolts for leaks. Tighten as needed if you spot any drips.

2017 KTM 85SX Owner-Specific Call-Outs

  • Use only full synthetic gear oil formulated for 2-stroke transmissions for maximum clutch and gear life.
  • Standard fill volume is 500ml, but always verify with the sight or check bolt method since over- or under-filling can impact shifting or clutch performance.
  • Always replace the crush washer to avoid leaks from the drain bolt.
  • Be mindful of the torque specification. Over-tightening the drain plug can damage the aluminum case threads.
  • If your bike frequently sees wet or muddy conditions, shorten your oil change interval—dirty oil can accelerate clutch and transmission wear.
  • Consult your owner's manual for approved oils and up-to-date capacities.

Conclusion

Routine oil changes with attention to detail will keep your 2017 KTM 85SX performing at its best, lap after lap. A small investment of time ensures reliability and maximum fun on the trail or at the track. For all your oil, tools, and protective gear—trust MotoSport.com, your source for everything dirt bike.

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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.