How to Change the Oil in a 2024 KTM 85SX BW

Shop parts for a 2024 KTM 85SX BW Dirt Bike.

Changing the oil in your 2024 KTM 85SX BW is one of the most important regular maintenance tasks you can do to keep your dirt bike running at top performance and to extend the life of its engine. This step-by-step guide, proprietary to MotoSport.com, will walk you through the tools needed, each part of the process, and specific tips you must know for this year, make, and model.

Tools & Supplies Needed

  • 8mm & 13mm socket or wrench
  • T-handle or ratchet
  • Oil drain pan
  • Magnetic drain plug (OEM if possible)
  • Crush washer (new, recommended each change)
  • Measuring cup or graduated oil bottle
  • Funnel
  • Clean rags
  • Rubber gloves (optional, for cleaner hands)
  • 500ml (0.5L) premium gear oil (see below for details)
  • Torque wrench

Recommended Oil & Quantity

  • Type: High quality gear oil formulated for 2-stroke transmissions. KTM and most experts recommend 10W-40 or similar premium motorcycle transmission oil.
  • Capacity: 500ml (milliliters) or 0.5L. This is the required amount for the KTM 85SX BW and is crucial to avoid over- or under-filling

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Step-by-Step Instructions

  1. Warm the Engine
    • Start your motorcycle and let it idle for 2-3 minutes. This helps the oil thin out and drain more thoroughly.
  2. Position the Bike
    • Place the bike on a secure stand with the wheels off the ground and the bike level for consistent draining and filling.
  3. Remove the Fill Cap
    • Find the oil fill cap on the right side of the engine. Unscrew it to allow air to enter and aid smooth draining

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  4. Drain the Oil
    • Locate the drain plug underneath the engine–typically a 13mm bolt. Place your drain pan under it and remove the plug with your wrench or T-handle. Be careful: the oil could be hot.
  5. Inspect and Clean the Drain Plug
    • The OEM plug is magnetic and will often catch small metal shavings. This is normal, but clean off all debris from the plug before reinstalling

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    • Replace the crush washer each oil change to prevent leaks.
  6. Reinstall the Drain Plug
    • Thread the drain plug (with a new crush washer) back into place by hand to avoid cross-threading. Finish tightening with a torque wrench:
    • Torque to 20Nm (14.8 ft-lbs) for the 2024 85SX BW

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  7. Pour in New Oil
    • Measure exactly 500ml of new, high-quality gear oil

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    • With a funnel, slowly pour the oil into the fill port.
  8. Check Oil Level (Specific for 85SX BW)
    • Reinstall the fill cap and start the engine briefly (about 30 seconds) to circulate the new oil.
    • Turn off the engine and place the bike upright (not leaning on the stand).
    • Remove the oil check screw (usually located on the side case above the drain plug).
    • The oil should just reach the bottom of this screw hole. If it overflows, let the excess drain out. Add a little if none comes out and check again

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  9. Reinstall the Check Screw and Fill Cap
    • Ensure both screws are secure but do not overtighten, which can damage threads or strip the small bolts

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  10. Clean Up & Final Inspection
    • Wipe any oil residue from the engine area. Dispose of old oil properly at a recycling center or autoshop.
    • Double-check for any leaks around the drain or check plugs after a short ride.

2024 KTM 85SX BW-Specific Call-Outs

  • Oil Capacity: Double-check that you use exactly 500ml—the 85SX's transmission is sensitive to incorrect oil levels

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  • Magnetic Drain Plug: Always clean the magnet. Fine shavings are normal, but excessive fragments could indicate a transmission issue.
  • Check Screw: Utilize the oil-level check screw after running the engine with the new oil. This is an extra assurance unique to the KTM 85 series that you have the correct level in the gearbox

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  • No Oil Filter: The KTM 85SX BW does not use an oil filter, making oil cleanliness and regular changes paramount.
  • Torque Values: The drain and check plugs are small; over-torquing is a common and costly mistake. Use a calibrated torque wrench

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Pro Tips for Success

  • Always change the oil more frequently if riding in muddy, wet, or dusty conditions.
  • Keep detailed records of oil changes for warranty and resale value.
  • Inspect drained oil for signs of water (milky color) or large metal fragments—these could indicate engine or transmission problems.
  • Using a dedicated KTM oil change kit can simplify the process by providing the correct oil, drain plug, and crush washer

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Conclusion

Changing the oil on your 2024 KTM 85SX BW is straightforward but requires attention to detail, the right tools, and the correct quantity of oil. By following these steps, you'll ensure your bike remains reliable, fast, and ready for the next ride. For all your maintenance supplies and OEM parts, trust MotoSport.com—a leader in dirt bike parts and service.

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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.