How to Change the Coolant in a 2015 Husqvarna TC85BW

Shop parts for a 2015 Husqvarna TC85BW Dirt Bike.

Routine coolant changes are crucial for keeping your 2015 Husqvarna TC85BW running cool – especially for a high-performance 2-stroke like this one. Proper maintenance prevents overheating, engine wear, and costly damage. Follow this MotoSport-exclusive guide tailored to your bike's system and design.

Tools & Supplies

  • New coolant appropriate for off-road dirt bikes
  • Drain pan
  • Socket set (for drain bolts)
  • Funnel
  • Shop towels
  • Protective gloves & eyewear

Preparation

  • Ensure the engine is cool before beginning, as the cooling system is pressurized at operating temperature.
  • Stand the bike upright to allow for a complete drain.
  • Remove the skid plate if equipped for easier access to the water pump area.

Step-by-Step Coolant Change Process

  1. Access the Cooling System
    Remove the radiator cap on the left radiator. This relieves system pressure and helps the coolant drain more freely.
  2. Drain Old Coolant
    Place your drain pan under the water pump cover (right side of the bike). Locate and remove the coolant drain bolt – usually the lower bolt on the water pump cover.
    Allow the coolant to drain fully. For fastest draining, loosen the radiator cap completely while the fluid is pouring out.
  3. Inspect and Flush (If Needed)
    If the coolant is dirty or you suspect contamination, flush the system with distilled water by briefly refitting the drain bolt, refilling the system, and draining again. Repeat until the fluid runs clear.
  4. Reinstall Drain Bolt
    Fit the drain bolt back in place. Tighten to the manufacturer’s specified torque to avoid leaks or stripping.
  5. Refill with Coolant
    Using a funnel, pour the recommended volume of fresh coolant into the radiator neck until just below the bottom of the fill port (avoid overfilling).
  6. Bleed Air from the System
    On the TC85, trapped air can cause hot spots. Tilt the bike side to side, gently compress radiator hoses, and tap the hoses with a gloved hand to help bubbles escape. Slowly refill if the level drops.
    On some models, a small bleed screw exists on top of the cylinder – consult your manual to see if your model features this. Crack it briefly until coolant flows without air, then re-tighten.
  7. Close and Check
    Refit the radiator cap securely.
    Clean away any spills and start the bike. Let it idle a few minutes to circulate the coolant, then shut down and check the level – top off as needed.

Model-Specific Notes for the 2015 TC85BW

  • Coolant system capacity: About 0.55 liters. Always double-check your owner’s manual for the correct quantity.
  • Use only recommended coolant: The TC85’s high-revving engine requires a non-silicate, ethylene glycol-based coolant – preferably one suitable for aluminum engine components. Racing-specific coolants are popular for this model.
  • Inspect hoses and clamps: While the system is empty, check all cooling system hoses and clamps for signs of deterioration. The TC85BW’s high vibration can loosen fittings over time.
  • Maintain correct air bleed: Improper bleeding is a common cause of overheating and hot spots on this engine platform.

Pro Tips

  • Change coolant every season or after any event that introduces mud, dirt, or contaminants into the system.
  • Carry a small bottle of pre-mixed coolant on race days as the TC85BW has a compact cooling system sensitive to volume loss.
  • Check the system for leaks after the first ride post-service.

MotoSport recommends following this guide each time you service your bike to extend engine life and maximize race-day performance.

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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.