How to Change the Coolant in a 2021 Husqvarna FE350HQ
Shop parts for a 2021 Husqvarna FE350HQ Dirt Bike.
The 2021 Husqvarna FE350HQ is renowned for its high-performance engine and advanced cooling system, essential for maximum efficiency whether you're trail riding or competing. Keeping the coolant fresh helps prevent overheating and protects your engine from internal corrosion. Here's a comprehensive, MotoSport-exclusive guide to changing the coolant on your FE350HQ along with important model notes.
Preparation: What You Need
- Pre-mixed coolant formulated for modern dirt bikes
- Socket wrench set (including 6mm for drain bolt)
- Funnel for clean pouring
- Catch pan or container for old coolant
- New crush washer or seal ring (recommended)
- Protective gloves and eyewear
- Clean rag
Refer to your owner's manual for coolant capacity and recommended coolant types for your FE350HQ. Only use ethylene glycol-based coolant compatible with aluminum engines.
Step 1: Cool Down – Safety First
- Ensure the bike is completely cool before starting.
- Stand the motorcycle upright on level ground for easy access and proper draining.
Step 2: Remove Skid Plate (If Equipped)
- If your FE350HQ has a skid plate, remove it to access the water pump and drain bolt for hassle-free draining.
Step 3: Remove Radiator Cap
- Locate the radiator cap on the left side of the bike above the radiator fins and carefully remove it to release any residual pressure.
Step 4: Locate and Remove the Drain Bolt
- The coolant drain bolt is on the lower side of the water pump cover. Use a 6mm socket or wrench.
- Position your catch pan beneath the drain bolt.
- Loosen and remove the bolt, allowing coolant to drain completely.
- Inspect the crush washer or seal ring; replace if damaged to ensure a leak-free seal during reinstallation.
Step 5: Flush (Recommended)
- For optimal cooling performance, flush the system with clean distilled water.
- Install the drain bolt loosely, add water through the radiator neck, and briefly start the engine (under 30 seconds) to circulate water.
- Turn off the engine, remove the drain bolt, and let the water drain out.
Step 6: Reinstall Drain Bolt
- Reinstall the drain bolt (with a new seal, if needed) and torque to 10 Nm (7.4 lbf ft).
Step 7: Fill with Fresh Coolant
- Using a funnel, pour pre-mixed coolant into the radiator until it reaches the base of the radiator filler neck.
- Let it settle and check for air bubbles. Topping off may be necessary as air escapes from the system.
Step 8: Bleed and Heat Cycle
- Start the engine with the radiator cap off and let it idle until warm.
Do not let coolant overflow – keep an eye on the fluid level. - Lightly tap hoses to dislodge trapped air bubbles.
- When no more bubbles appear, shut off the engine and let it cool to ambient temperature.
- Check and top off coolant level again in both radiator and expansion tank (if equipped).
Step 9: Reinstall Radiator Cap and Skid Plate
- Replace the radiator cap securely.
- Reattach skid plate if removed.
Step 10: Final Inspection
- Start the bike, let it idle, check for leaks, and monitor the temperature gauge during your next ride.
- Recheck the coolant level after your first heat cycle – topping up as needed.
2021 FE350HQ Owner Notes
- The FE350HQ uses a compact, aluminum semi-double-cradle frame with precisely routed cooling hoses for optimal engine temperature regulation.
- Be cautious with aftermarket coolant additives. Only use manufacturer-approved products to protect magnesium and aluminum cooling components.
- If your model has an auxiliary expansion/overflow reservoir, always check and fill it as well. This helps manage coolant expansion and contraction during temperature swings.
- Avoid over-tightening bolts to prevent thread damage on magnesium cases.
Regular coolant replacement is essential to keep your Husqvarna FE350HQ performing like new – and prevents costly repairs down the road.
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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.