How to Change the Coolant in a 2017 Husqvarna TC85

Shop parts for a 2017 Husqvarna TC85 Dirt Bike.

Keeping your 2017 Husqvarna TC85 running at its peak means routine maintenance – and that includes changing the coolant. Coolant protects your engine by regulating temperature and preventing corrosion, which is especially vital for 2-stroke performance engines like the TC85. This step-by-step, MotoSport-exclusive guide explains the process for flushing and replacing your coolant, and highlights some key tips specifically for your dirt bike.

What You Need

  • Fresh coolant compatible with aluminum engines (Engine Ice or Motul Motocool recommended for high-performance two-strokes)
  • 8mm socket or wrench
  • Ratchet or T-handle
  • Funnel
  • Drain pan
  • Shop towels or rags
  • Safety gloves and eye protection
  • Torque wrench (optional, for drain bolt reinstallation)

Preparation

  • Always work on a cold engine to prevent burns from hot components or coolant.
  • Place your TC85 on a stable stand and ensure it is level for even draining.
  • Give yourself plenty of workspace, as some coolant may splash.

1. Access the Radiator and Drain Bolt

  • Remove the right side cover if needed for easier access to the radiator fill cap and draining area.
  • Locate the radiator cap (on the right top of the radiator) and the coolant drain bolt (often at the bottom of the water pump cover, 8mm head).

2. Drain the Old Coolant

  • Carefully loosen and remove the radiator cap to relieve pressure in the system.
  • Position your drain pan under the water pump area.
  • Remove the 8mm drain bolt and allow coolant to drain completely. Tilting the bike slightly side-to-side helps evacuate any trapped fluid in both radiators.
  • Optionally, flush with distilled water for additional cleaning – refill via the radiator cap, run briefly, and drain again.

3. Inspect the O-Ring and Clean

  • Check the drain bolt O-ring for damage and replace if necessary.
  • Clean any residue from the bolt and water pump area to ensure a proper seal and easier inspection at the next service.

4. Reinstall the Drain Bolt

  • Reinstall the drain bolt and gently tighten it. For best results, use a torque wrench and tighten to the manufacturer's recommended spec (typically around 6-8 Nm for small bikes).

5. Refill the System

  • Using your funnel, slowly pour in new coolant until it reaches the bottom of the radiator fill neck.
  • On some TC85 models, there is a small bleeder screw near the cylinder head – loosen this briefly as you fill to release trapped air, then retighten after a steady stream of coolant appears. This is important for precise filling, as trapped air can cause overheating.
  • If no bleeder screw exists, gently rock the bike side-to-side and carefully squeeze the radiator hoses to encourage any air to rise to the fill port.

6. Final Steps

  • Reinstall the radiator cap.
  • Clean up any spilled coolant from the bike and floor.
  • Start and run the engine for several minutes, then let it cool completely before rechecking the coolant level. Add coolant if necessary – it should always be at the bottom of the radiator neck when cold.

Important Model Notes for TC85 Owners

  • Only use coolant rated for aluminum engines to avoid corrosion. Ethylene glycol formulas are common, but many riders choose a performance coolant for racing conditions.
  • The TC85's compact radiators mean it is crucial to regularly check fluid levels, especially after hard rides or muddy conditions that can clog cooling fins.
  • Inspect hoses, radiator for leaks, and water pump function at every coolant change for signs of aging or damage.
  • In some race situations or extreme climates, a higher boiling point coolant is recommended to prevent overheating.

Environmental & Safety Notes

  • Coolant is hazardous to animals & the environment. Collect and dispose of used coolant responsibly at a recycling or hazardous waste collection site.
  • Rinse skin or eyes immediately and thoroughly if you come into contact with coolant.

Consistent cooling system maintenance keeps your 2017 Husqvarna TC85 at top performance – and on the track where it belongs.

Related Shopping Categories

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Shop Radiator Hoses for a 2017 Husqvarna TC85 Dirt Bike.

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.