How to Change the Coolant in a 2018 Husqvarna TE300

Shop parts for a 2018 Husqvarna TE300 Dirt Bike.

Routine coolant changes are vital for keeping your 2018 Husqvarna TE300’s engine performing at its best, especially if you ride aggressively or in varied climates. This maintenance step helps prevent overheating, corrosion, and internal engine damage—protecting your two-stroke’s unique powerplant. Here is a MotoSport-exclusive, step-by-step guide tailored for TE300 owners.

Essential Tools and Supplies

  • Fresh motorcycle-specific coolant (use pre-mix or mix with distilled water as directed)
  • 10 mm socket or wrench
  • Catch pan or container for old coolant
  • Funnel
  • Shop rags
  • Eye and hand protection

Preparation

  • Park the bike upright on a level surface.
  • Let the engine cool completely to avoid burns (never open a hot radiator cap).
  • Remove the seat and shrouds as needed for easier access to the radiators and cap.

Draining Old Coolant

  • Locate the water pump cover on the right side of the engine. The coolant drain bolt is a 10 mm bolt with a copper washer—on KTM/Husqvarna 300cc two-strokes, it’s typically at the lowest point on the cover and sits above the power valve area.
  • Place a catch pan below the drain bolt and slowly remove the bolt.
  • Carefully open the radiator cap to let air in, which speeds up coolant flow.
  • Allow all coolant to drain from both radiators. Gently lean the bike side-to-side to help empty residual fluid.

Flushing (Optional but Recommended)

  • Reinstall the drain bolt loosely and fill the system with distilled water.
  • Run the engine briefly (do not allow it to get hot) to circulate water, then shut it off and repeat the drain procedure.
  • This flushes out any lingering sediment or old coolant.

Refilling with Fresh Coolant

  • Reinstall and tighten the drain bolt with the copper washer (do not overtighten).
  • Using a funnel, fill the radiator slowly until just below the filler neck.
  • Bounce the bike and gently squeeze radiator hoses to eliminate trapped air.
  • Top off the coolant, then reinstall the cap securely.

Final Checks

  • Wipe any spilled fluid and reinstall any removed parts.
  • Start the engine and let it idle to operating temperature with the bike upright. Watch for any leaks at the drain bolt, radiator, or hose junctions.
  • Let the engine cool, recheck coolant level, and top up if necessary.

Special Considerations for the 2018 Husqvarna TE300

  • Coolant System Access: The TE300 uses cast aluminum radiators with a robust two-stroke water pump. Removing both radiator shrouds may greatly ease access for cleaning and filling.
  • Coolant Bolt Location: Some confusion exists with drain bolt placement on this engine series—it is on the right side above the power valve and uses a copper washer for effective sealing.
  • Fan and Overheating Issues: If your TE300 is fitted with a radiator fan, use high-quality coolant and keep the system clean to prevent temp-related electrical cutoffs common on long technical rides or enduro loops.

Dispose of Used Coolant Responsibly

  • Always dispose of old coolant at an authorized recycling center. Coolant is toxic to people, pets, and the environment.

A regular coolant change extends engine life and performance. MotoSport offers all the OEM and aftermarket parts you need for every service task—from high-efficiency radiators to replacement water pump seals. If you run extreme conditions, consider more frequent changes or using performance coolants designed to handle the intense heat of hard enduro riding.

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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.