How to Change the Coolant in a 2025 Husqvarna TC300

Shop parts for a 2025 Husqvarna TC300 Dirt Bike.

The 2025 Husqvarna TC300 features a refined liquid-cooled 2-stroke engine with electronic fuel injection and an internal thermostat for consistent cooling performance. Regular coolant changes protect the engine and ensure peak track performance, crucial for any owner aiming for maximum reliability and longevity.

What You Need

  • Service stand
  • Protective gloves & eyewear
  • Drain pan
  • Appropriate coolant (refer to the owner's manual for coolant specification)
  • Socket set
  • Funnel
  • Clean rags

Step-by-Step Guide

  1. Prepare the Bike
    Place your TC300 on a level service stand and allow the engine to cool. Never service the cooling system while hot due to the risk of pressurized steam and burns.
  2. Remove Plastics for Access (if needed)
    Remove any shrouds or plastics required to reach the radiator cap and coolant drain plug. The TC300's open and organized layout provides straightforward access to these areas.
  3. Open the Radiator Cap
    Loosen and remove the radiator cap slowly to release any residual pressure. This step improves coolant flow during drainage and is made easy by the TC300's clear component markings.
  4. Drain the Coolant
    Locate the coolant drain bolt–on the TC300, this is marked on the engine cover for convenience. Position a drain pan under the bolt, then remove the drain bolt and allow coolant to fully drain from both radiators.
    For faster draining, gently rock the bike side to side. Check that both radiators are empty before proceeding.
  5. Inspect and Clean
    Wipe the drain area and radiator neck with a clean rag. Inspect the drain bolt O-ring or washer for wear; replace if needed.
  6. Refit the Drain Bolt
    Reinstall the drain bolt, tightening to the recommended specification. Husqvarna's new engine cover markings help ensure you locate the correct bolt without guesswork.
  7. Fill with Fresh Coolant
    Using a funnel, slowly add the manufacturer-recommended coolant into the radiator. Pour until the level nears the top of the radiator neck, allowing any bubbles to escape. The TC300's internal thermostat helps purge air, but gently squeezing the radiator hoses can assist de-airing.
  8. Check for Leaks and Top Off
    With the cap still off, briefly start the engine and let it idle for less than a minute. This circulates coolant and purges remaining air. Shut off the bike, top up if necessary, then securely replace the radiator cap.
  9. Reinstall Plastics and Clean Up
    Refit the shrouds or plastics. Wipe away any spilled coolant from the frame, engine, or radiators.
  10. Inspect and Ride
    After the first ride, recheck your coolant-level – expansion or trapped air may cause a minor drop. Top off as needed.

Model-Specific Notes for the 2025 TC300

  • The 2025 TC300's engine features clearly marked drain and fill points, making regular maintenance quicker and less error-prone.
  • The large center tube through the frame reduces coolant system pressure, enhancing both cooling efficiency and long-term reliability. An internal thermostat maintains optimal operating temperature, so always use the specified coolant type to prevent thermostat sticking or corrosion.
  • The high-performance, competition-based design means even small lapses in cooling system upkeep can impact power and longevity. Always verify system sealing and never substitute unapproved coolants.

Keeping the 2025 Husqvarna TC300's cooling system in peak condition ensures maximum power delivery and engine life whether you're at the track or on the trails.

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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.