How to Change the Oil in a 2021 Husqvarna TC85BW

Shop parts for a 2021 Husqvarna TC85BW Dirt Bike.

Regular gear oil changes are crucial for maintaining the performance and longevity of your 2021 Husqvarna TC85BW. This in-depth guide, proprietary to MotoSport.com, will walk you through the exact steps required for a smooth oil change, along with important tips and model-specific details to ensure a professional result.

Tools and Supplies Needed

  • 8mm T-handle or socket wrench (for the drain plug)
  • Torque wrench (to ensure correct bolt tightening)
  • Oil drain pan or bucket
  • Funnel (to avoid spills during refilling)
  • Shop towels or rags
  • Replacement crush washer (recommended for each oil change)
  • Motorex/Motul Trans Oil or equivalent high-quality gear oil (specifically, 500cc or 0.5L)
  • Protective gloves (optional but recommended)
  • Service stand (to keep your dirt bike upright and level)

Preparation Steps

  • Start your engine and let it idle for 1-2 minutes. This helps warm the oil, making it flow out more completely when drained.
  • Turn off the engine and place your TC85BW securely on a service stand. Ensure the motorcycle is upright and level.
  • Clean around the oil fill and drain plug area to prevent debris from entering your engine.

Draining the Old Oil

  • Place the drain pan underneath the gear oil drain plug. On the Husqvarna TC85BW, the drain plug is located at the bottom of the right side of the engine case.
  • Use the 8mm wrench or T-handle to carefully loosen and remove the drain plug. Allow all old oil to completely drain into the pan.
  • Check the condition of the crush washer. If worn or damaged, replace it with a new one to prevent oil leaks.
  • Let the oil drain for several minutes. Rocking the bike gently can help remove the last bits of old oil.
  • Clean the drain plug and the sealing surface on the engine for proper re-sealing.

Reinstalling the Drain Plug

  • Reinstall the drain plug and the new or inspected crush washer.
  • Using a torque wrench, tighten the drain plug to the specification (typically 15 Nm or about 11 ft-lb). Over-tightening can strip the threads or damage the engine casing, so proper torque is crucial.

Refilling with Fresh Gear Oil

  • Locate the oil fill cap on the same side as the drain plug.
  • Remove the fill cap and insert a funnel for a spill-free experience.
  • Pour in 500cc (0.5L) of high-quality gear oil (such as Motorex or Motul Trans Oil)–do not overfill.
  • Replace and hand-tighten the fill cap.

Checking the Oil Level

  • Start the engine and let it idle for 30 seconds, then switch it off and let the oil settle for a minute.
  • Check for leaks around the drain and fill plug.
  • If your model has an inspection window or a check bolt, verify that the level is correct. On the TC85BW, 500cc is the exact capacity, so if measured carefully, you're set.

Cleanup and Proper Oil Disposal

  • Wipe any spilled oil from the engine and floor with shop towels.
  • Dispose of old oil responsibly—never pour it down the drain or on the ground. Most auto parts stores and service shops accept used oil.

Model-Specific Callouts for the 2021 Husqvarna TC85BW

  • The TC85BW's oil drain plug comes with a magnetic tip—clean this magnet thoroughly, as it traps any excess metal shavings from the transmission.
  • Always use the correct specification and quantity: 500cc (0.5 liters) of 2-stroke transmission oil only. Using the wrong oil or amount can lead to clutch issues or transmission damage.
  • Reuse of old crush washers may lead to leaks. Always replace with a fresh washer when available.
  • Check for leaks and oil level again after your first ride post-change. Top off only if necessary.

Final Tips

  • Change your gear oil every 10-20 riding hours, or after every race event, for maximum gearbox and clutch protection.
  • Document your maintenance in a log or the owner's manual for easy tracking and warranty protection.
  • Always refer to your owner's manual for the most up-to-date specifications regarding oil type and torque values.

The steps above are designed specifically for the 2021 Husqvarna TC85BW. Following them precisely will help ensure your bike delivers optimal performance every time you ride.

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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.