How to Change the Coolant in a 2018 Husqvarna TX300
Shop parts for a 2018 Husqvarna TX300 Dirt Bike.
Changing the coolant in your 2018 Husqvarna TX300 is a fundamental maintenance procedure that protects your two-stroke powerplant from overheating and internal corrosion. This guide details each step you need for a reliable coolant change, along with model-specific notes every TX300 owner should know.
What You Need
- Fresh coolant (consult your owner manual for specification, typically a high-quality ethylene glycol-based, silicate-free formula)
- Distilled water (for rinse/flush)
- 8mm or 10mm socket (for drain bolt)
- Catch pan/container
- Funnel
- Clean rag
- Gloves
Step-by-Step Guide
-
Cool the Bike – Prep for Draining:
Ensure the TX300 is completely cool before starting. Park it on a level stand to keep fluid distribution even, ensuring you drain all coolant from both radiators. -
Locate the Coolant Drain Bolt:
On the TX300, the coolant drain bolt is positioned on the right side of the engine, just above the power valve cover. Put your catch container beneath this spot to avoid mess.
Note: Some riders mistakenly use the left-side bolt; for this model, always use the right-side bolt for proper draining. -
Drain the Old Coolant:
Loosen the radiator cap to help air enter and speed up draining.
Remove the drain bolt and allow all coolant to flow into the pan. Shift the bike side to side gently to help empty both radiators. -
Flush the Cooling System:
Replace the drain bolt and fill the radiators with distilled water. Run the engine for a minute (do not overheat), shut off, and drain again. Repeat until water drains clear. This step clears residues left from previous coolant types and contaminants. -
Refit – Add New Coolant:
With the drain bolt secured, add the new coolant via the radiator cap opening, slowly filling up to the fins inside the radiator neck. Typically, the TX300 requires around 1.1 liters, but check your specific capacity. -
Bleed Air – Final Check:
Start the engine and let it idle. As the coolant circulates, squeeze each radiator hose gently to help bleed trapped air. Shut off and top off to the correct level if necessary. -
Clean Up:
Refit the cap snugly. Wipe any spills. Dispose of old coolant responsibly – it is toxic to people, pets, and wildlife.
Notes for the 2018 Husqvarna TX300 Owner
- The TX300 shares its cooling layout with KTM two-strokes, but has distinctive radiator placements and drain hardware. Always double-check the service manual for your exact model.
- Using the correct coolant is essential: silicate-containing formulas can damage the TX300's lightweight aluminum components over time.
- If switching between coolant types (e.g. from green to orange, or to a race-specific coolant), a thorough flush with distilled water is crucial to prevent harmful cross-contamination.
- Regular coolant changes (every two years, or more frequently for hard or muddy riding) will keep your TX300 running cool, reliable, and ready for the next trail or race day.
- Inspect your radiator hoses and clamps during coolant changes. Replace any with signs of wear, bulging, or softness to prevent leaks and overheating.
Routine coolant maintenance helps deliver consistent engine temperatures, resists boil-over in challenging off-road conditions, and protects your Husqvarna TX300 for the long haul. Keeping to this maintenance schedule ensures top performance whenever you hit the track or trail.
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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.