How to Change the Coolant in a 2019 Husqvarna FS 450: MotoSport Exclusive Guide
Shop parts for a 2019 Husqvarna FS 450 Dirt Bike.
Changing the coolant in your 2019 Husqvarna FS 450 is a fundamental maintenance task that helps prevent overheating, ensures optimal engine performance, and extends the life of your dirt bike. The FS 450 features a high-strung, race-oriented 450cc engine with advanced cooling demands, so keeping fresh coolant in the system is especially critical for reliability during intense use. Use this MotoSport-exclusive guide to change your coolant confidently and keep your race bike performing at its best.
What You Will Need
- Suitable dirt bike coolant (avoid silicate-containing coolants; many riders use premium brands made for powersports)
- Drain pan/collection container
- Gloves & rags
- Basic metric tools (socket set, Allen keys)
- Distilled water (for flushing, if desired)
FS 450 Coolant Capacity
- Total system capacity: Approx. 1.8 liters (for a full flush and refill)
Step-by-Step Coolant Change Procedure
- Let the engine cool–never open the radiator cap on a hot engine. Steam or boiling coolant can cause serious burns.
- Access the cooling system: Remove the seat and right side cover of your FS 450 to reach the radiator cap and hose/fittings. The process requires minimal disassembly thanks to the dirt bike‘s accessible design.
- Remove the radiator cap slowly to relieve any residual pressure.
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Locate and remove the coolant drain bolt: On the FS 450, the coolant is typically drained via a bolt on the lower water pump housing (right side of engine). Position your drain pan underneath, then use the appropriate socket or Allen key to remove the drain bolt and allow coolant to completely drain out.
Tip: Opening the radiator cap fully and slightly tilting the bike (using a rear stand) helps evacuate all coolant. - Flush (optional but recommended): Reinstall the drain bolt temporarily and fill the system with distilled water. Start the engine and run it for a brief moment, then drain again to remove any residue, debris, or old coolant.
- Replace the drain bolt: Install the drain bolt and tighten securely. Wipe away any spilled coolant from the surfaces.
- Refill with fresh coolant: Pour new coolant into the radiator filler neck slowly, allowing air bubbles to escape. Fill up to just below the neck.
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Bleed the system: Squeeze the upper and lower radiator hoses gently to help dislodge trapped air. Allow the bike to idle with the radiator cap off for a minute, adding more coolant if the level drops.
Check for leaks while the system is under pressure. - Install the radiator cap and check level: After a brief ride, re-check the coolant level and top off if needed.
Important FS 450 Coolant System Notes
- The 2019 FS 450 shares its coolant circuit with KTM motocross and supermoto models but uses Husqvarna-specific radiators and shrouding for optimal racing airflow.
- Always use motocross-formulated coolant–never standard automotive coolant.
- If you regularly ride in extreme heat or race conditions, consider using high-performance or racing-specific coolant for enhanced temperature stability.
- The FS 450 does not have a fan from the factory; excessive idling may cause overheating if the coolant is old or low.
Final Checks
- Inspect for leaks from the drain bolt, hoses, and radiator seams.
- Reinstall the side cover and seat securely.
- Record the service in your maintenance log for future reference.
Regular coolant changes will help your 2019 Husqvarna FS 450 maintain performance lap after lap—protecting its competition-spec engine from the inside out. MotoSport stocks everything you need to keep your ride running strong.
Related Shopping Categories
Shop Radiators for a 2019 Husqvarna FS 450 Dirt Bike.
Shop Coolant for a 2019 Husqvarna FS 450 Dirt Bike.
Shop Temperature Sensors for a 2019 Husqvarna FS 450 Dirt Bike.
Shop Tools for a 2019 Husqvarna FS 450 Dirt Bike.
Shop Radiator Hoses for a 2019 Husqvarna FS 450 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.