How to Change the Coolant in a 2022 Husqvarna TX300i

Shop parts for a 2022 Husqvarna TX300i Dirt Bike.

Maintaining optimal engine temperature is vital for the performance and longevity of your 2022 Husqvarna TX300i. Changing the coolant ensures your high-performance two-stroke stays protected from overheating–especially important for this fuel-injected model. Here is a proprietary MotoSport guide to flushing and refilling your coolant that every TX300i owner can follow with confidence.

What Makes the 2022 TX300i Unique?

  • Fuel-injection system–The TX300i features a transfer port injection (TPI) system, demanding coolant that resists deposit build-up to protect delicate injectors and sensors.
  • High-revving motor–Aggressive trail or race riding creates more heat, so monitoring coolant health is critical.
  • Dual radiators–Both radiators must be fully drained and refilled to avoid air pockets and uneven cooling.
  • Potential coolant loss–Some owners have observed coolant loss issues, making regular checks and maintenance especially important for this model.

What You Will Need

  • Fresh, motorcycle-specific coolant (refer to owner's manual for specification)
  • Basic hand tools (socket wrench, pliers, and screwdrivers)
  • Catch pan for old coolant
  • Funnel
  • Clean rags

Step-by-Step Coolant Change Procedure

  1. Cool Down the Engine
    Ensure the bike is completely cool before starting to prevent burns and pressurized fluid spray.
  2. Remove Skid Plate (if fitted)
    For easier access to the water pump and drain bolt, remove any skid plate.
  3. Access the Radiator Cap
    Remove the right side panel to access the radiator cap. Open the cap to relieve any pressure and allow air in, expediting draining.
    Tip: Place the bike upright on a lift or stand to ensure complete drainage.
  4. Drain the Old Coolant
    Locate the coolant drain bolt–usually on the water pump cover, beneath the right side of the engine. Place a catch pan under the bolt. Remove the bolt and allow coolant to drain completely from both radiators.
    Inspect the coolant for contamination or discoloration, which may indicate engine issues.
  5. Flush the System (Recommended)
    Replace the drain bolt, pour distilled water into the radiator, and drain again. Repeat until water runs clear. NEVER run the engine with plain water in the system; this is a flush only.
  6. Reinstall Drain Bolt
    Ensure the drain bolt and any sealing washers are free of debris. Torque to manufacturer's specification.
  7. Pour in New Coolant
    Using a funnel, slowly fill the radiator to the base of the filler neck. Allow it to settle and top up as needed until the fluid remains at the desired level.
    Filling slowly reduces the risk of air pockets–a common concern with the TX300i's dual radiator setup.
  8. Bleed Air from the System
    With the bike upright, gently rock it side to side and squeeze radiator hoses to help any trapped air escape. Leave the radiator cap off for now.
  9. Heat Cycle & Top Off
    Start the bike and let it idle until fully warm, watching for air bubbles. Shut it down, let cool, and check coolant level again. Top off as needed.
  10. Check for Leaks
    Inspect around the drain bolt, hoses, and radiator seams for leaks.
  11. Reinstall Panels & Skid Plate
    Refit all removed parts and clean up any spills.

Key Tips for the TX300i Owner

  • Consistently monitor coolant level–the TX300i has a reputation for some coolant loss between service intervals.
  • Use only recommended, silicate-free coolant to protect magnesium engine cases and delicate sensors.
  • Ensure no air pockets by filling slowly and cycling the system twice if needed.
  • Replace any worn seals, clamps, or hoses noticed during the service.

Routine coolant changes keep your 2022 Husqvarna TX300i running at peak power–whether you are racing or hitting your favorite trail. Do not neglect this essential task.

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Shop Tools for a 2022 Husqvarna TX300i Dirt Bike.

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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.