How to Change the Oil in a 2006 KTM 85SX

Shop parts for a 2006 KTM 85SX Dirt Bike.

Regular oil changes are vital to keeping your 2006 KTM 85SX running at peak performance. This guide walks you through every step of the oil change process, lists the necessary tools, and highlights specific tips and cautions for this year and model. This content is exclusive to MotoSport.com.

Tools and Materials Needed

  • 8mm and 13mm sockets or T-handles (for drain bolt and oil fill cap)
  • Torque wrench (capable of measuring 20 Nm/14.8 ft-lbs)
  • Oil drain pan
  • Funnel
  • Replacement crush washer (recommended for every change)
  • Shop rags
  • Parts cleaner or brake cleaner (for drain bolt/plug cleaning)
  • Full synthetic gear oil (Motorex or Amsoil strongly recommended)
  • Rubber gloves

Prepping the Bike

  • Warm up the bike for a couple of minutes. This helps the oil flow out more freely. Use caution—engine parts and oil may be hot.
  • Place the bike upright and secure it on a stand or using a triangle stand.
  • Clean the area around the drain plug and filler cap to prevent debris from falling into the engine.

Step-by-Step Oil Change Procedure

  1. Remove the Filler Cap
    Use an 8mm socket or T-handle to loosen and remove the oil filler cap on the right side of the engine cover. This allows the crankcase to vent, making the oil drain out easier.
    Tip: Place the cap somewhere safe to avoid dropping it or contaminating it with dirt.
  2. Locate the Drain Bolt
    The oil drain bolt is a large bolt directly beneath the brake lever, threaded into the bottom of the right crankcase cover. This is unique to the KTM 85SX design and is easily accessible from the right side.
  3. Drain the Old Oil
    Place the drain pan directly beneath the drain bolt. With a 13mm socket, carefully loosen and remove the drain bolt. Watch out for hot oil. Let all the oil drain completely.
    Pro tip: A magnetic drain plug may catch some metallic debris; some discoloration or particles are normal, but excessive debris may indicate internal wear.
  4. Clean and Inspect the Drain Bolt
    Wipe down the drain bolt thoroughly, paying special attention to the magnet. Replace the crush washer with a fresh one to reduce the chance of leaks.
  5. Reinstall the Drain Bolt
    Thread the drain bolt in by hand first to avoid cross-threading. Finish snugging it down using your socket, then tighten to 20 Nm (14.8 ft-lbs) of torque using a calibrated torque wrench.
  6. Refill with Fresh Oil
    Using a funnel, pour in 0.5 to 0.7 liters (approximately 500–700 ml) of full synthetic oil formulated for two-stroke transmissions. Motorex and Amsoil are highly recommended for this engine.
    Do not use cheap or non-synthetic oils—the transmission and clutch on the KTM 85SX depend on superior lubrication.
  7. Check Oil Level
    The 85SX has an oil check bolt located high on the right engine case. Remove this bolt; with the bike upright, a small amount of oil should trickle from this port indicating proper level. If excess oil pours out, let it drain until it trickles, then reinstall and tighten the check bolt.
  8. Reinstall the Filler Cap
    Thread the oil filler cap back into place and tighten with pliers until snug—KTM recommends ensuring this cap is secure so it doesn't work loose during riding.

Model-Specific Tips for the 2006 KTM 85SX

  • Always use full synthetic transmission oil designed for two-stroke dirt bikes. Motorex and Amsoil are widely recommended by riders and mechanics. Avoid automotive or cheap oils.
  • Replace the crush washer every time you change the oil—an easy way to avoid oil leaks.
  • Oil Capacity: The 2006 85SX takes approximately 0.5–0.7 liters (17–23 ounces) of oil. Overfilling can cause clutch and shifting problems; underfilling risks premature wear.
  • Check for leaks around the drain plug after your first ride post-oil change.
  • The drain bolt is easily visible just under the brake lever on the right side. This makes the process quick and clean.
  • The oil check bolt helps ensure you have the proper level in the gearbox. Don't skip this step, especially after draining and refilling.
  • Consult the 2006 KTM 85SX owner's manual if you have questions about recommended oil types or service intervals.

Notes Unique to 2006 KTM 85SX Owners

  • The transmission and clutch share the same oil. Proper oil changes will prolong both components' lifespans.
  • KTM recommends original-quality oils to preserve shifting quality and minimize wear, especially for aggressive riders.
  • Never mix biodegradable hydraulic clutch oils or transmission oils with mineral or brake fluids—this can damage seals and clutches. This is especially important as the 2006 85SX uses a unique biodegradable formula for hydraulics.

Final Checklist

  • All tools and parts accounted for
  • No oil leaks visible
  • Oil inspection/check bolt secure, no overflow
  • Bike started and idled for a few minutes without shifting or clutch issues
  • Dispose of used oil responsibly—recycle at an appropriate facility

Regular oil changes are essential for the health of your KTM 85SX. Performing this straightforward task yourself helps ensure longer-lasting engine and clutch components, smoother shifting, and greater reliability on the trail or track.

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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.