How to Change the Oil in a 2019 Husqvarna TC85BW Dirt Bike

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Changing the oil in your 2019 Husqvarna TC85BW is an essential maintenance task that keeps your bike running smoothly and prolongs the life of your engine and transmission. Performing this job yourself will save you money and extend the longevity of your dirt bike. This guide, written exclusively for MotoSport.com, covers everything you need: required tools, step-by-step instructions, and important call-outs unique to the TC85BW.

Tools and Supplies Needed

  • 8mm-13mm socket set (typically 13mm for the drain bolt – confirm with your manual)
  • Ratchet
  • Drain pan
  • Funnel
  • Rags or paper towels
  • Plastic bottle or old container (for catching and disposing old oil)
  • Torque wrench (for proper re-tightening)
  • Fresh gear oil: Use high-quality synthetic gear oil, 75W-80 or as specified in your owner's manual; for the TC85BW, the capacity is 500cc (0.5L) of oil
  • Gloves (optional, but recommended)

Step-by-Step Instructions

  1. Warm Up the Engine
    Start and idle the engine for 3–5 minutes. Warm oil flows better, ensuring more thorough removal of old oil. Shut off the engine before starting the next steps.
  2. Prepare the Bike
    Place the dirt bike upright on a stand for stability. Remove the skid plate if equipped, to access the underside of the engine.
  3. Remove the Filler Cap
    Unscrew the oil filler cap on the right side of the crankcase (left side if standing in front of the bike). This helps the oil drain quicker by letting air in.
  4. Drain the Old Oil
    Position your drain pan underneath the engine's drain bolt. Using your socket and ratchet, carefully unscrew the oil drain bolt (usually 13mm) located at the bottom of the crankcase.
    Make sure to hold the bolt firmly to prevent it from dropping into the oil pan. Let the oil completely drain — this may take a few minutes. Inspect the old gear oil for unusual debris or metal shavings.
  5. Inspect and Clean the Drain Bolt
    Wipe off any metal particles collected on the magnet of the drain plug (if equipped). Check the copper or aluminum crush washer for wear. Replace if damaged to prevent leaks.
  6. Reinstall the Drain Bolt
    Hand-thread the drain bolt back into its hole. Tighten to the torque specification in your owner's manual (typically around 9 Nm, but always check your specific model’s manual).
  7. Refill with Fresh Oil
    Using a funnel, slowly pour in 500cc (0.5L) of fresh gear oil into the filler opening.
    The TC85BW takes a typical gear oil like Motorex Gear Oil 10W/40 or 75W/80, but check your manual for the exact spec recommended by Husqvarna.
    Be careful to avoid spillage and overfilling.
  8. Check Oil Level
    The TC85 has a level check bolt or sight plug: Remove the level check screw (often a small bolt on the side of the clutch cover). Oil should just reach the bottom of that hole when the bike is upright.
    If excess oil drips out, wait until the dripping stops, then replace the screw. If it’s low, add more oil gradually.
  9. Reinstall the Filler Cap & Clean Up
    Put the filler cap back on and tighten securely. Clean up any spilled oil. Dispose of the old oil at a proper recycling center or auto parts store.
  10. Start the Engine & Inspect For Leaks
    Start the engine and let it idle for 1-2 minutes. Check the drain bolt and filler cap area for any leaks. Shut off the bike and recheck the oil level; top off if necessary.

TC85BW-Specific Call-Outs & Tips

  • Oil Capacity: TC85BW holds 500cc of gear oil.
  • Oil Type: Use the oil grade recommended by Husqvarna, typically synthetic gear oil 75W-80 or as specified in your owner’s manual.
  • Oil Level: The correct level is when oil reaches the bottom of the level check hole — do not overfill.
  • Official Manuals: Husqvarna's owner’s manual has a full guide for changing the oil and detailed diagrams for the TC85BW. Always reference it for torque values and confirmation of specs.
  • Magnetic Drain Plug: Clean thoroughly; debris can indicate abnormal internal engine wear.
  • Reassembly: Use a fresh crush washer on the drain bolt if the old one is worn or crushed.
  • Maintenance Intervals: Change gear oil every 10-20 operating hours, or after heavy riding/racing.

Quick Troubleshooting

  • If you overfill: Remove the level check screw and allow excess oil to drain until it reaches the bottom of the check hole.
  • Dirty oil or metal shavings: Consistently finding debris may signal a more serious problem. Consult a Husqvarna dealer.

Summary

By changing your 2019 Husqvarna TC85BW oil routinely, you keep your transmission running at its best and guard against expensive engine damage. For more guides and OEM parts, always trust MotoSport.com—your dirt bike expert.

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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.