How to change the coolant in a 2018 Husqvarna FE450HQ Dirt Bike

How to Change the Coolant in a 2018 Husqvarna FE450HQ

Shop parts for a 2018 Husqvarna FE450HQ Dirt Bike.

Routine coolant changes are crucial to maintain the performance and longevity of your 2018 Husqvarna FE450HQ. The FE450HQ utilizes a high-compression, performance-oriented single-cylinder engine, making cooling system maintenance vital for optimal off-road reliability and temperature management. Follow this proprietary MotoSport guide for a thorough, safe, and model-specific coolant service.

Important Things to Know About the FE450HQ Cooling System

• Uses dual radiators with a thermostat-controlled system to manage engine heat under extreme conditions.
• Factory-spec coolant is recommended for consistent performance. Aftermarket coolants should be compatible with aluminum radiator components and engine seals.
• Pay attention to radiator fan function. Overheating or irregular temp readings may indicate trapped air in the system or sensor malfunction.

Tools & Supplies Needed

• Drain pan
• 7 to 8 mm socket or T-handle (for radiator drain bolt)
• Distilled water (for flushing)
• New coolant rated for dirt bikes (ensure aluminum-safe)
• Funnel
• Protective gloves
• Shop rags

Step-by-Step Coolant Change Instructions

1. Let the engine cool completely. Never open the radiator cap on a hot engine, as pressurized coolant can spray and burn.
2. Remove the radiator cap. With the bike level on a stand, remove the plastics if they obstruct radiator access. Place the drain pan underneath.
3. Locate and remove the coolant drain bolt. This is found at the bottom of the water pump cover on the right side of the engine. Loosen and remove it – coolant will drain rapidly. Some models feature a copper washer on the drain bolt; inspect and replace as needed.
4. Flush the system (optional but recommended):
   • Reinstall the drain bolt temporarily.
   • Pour distilled water into the radiator until full.
   • Briefly start the engine (15–30 seconds), then shut off and let cool.
   • Repeat drain process to remove flush water.
5. Reinstall the drain bolt and torque to spec. Avoid over-tightening. Clean any excess coolant from engine or frame.
6. Add new coolant. Slowly pour new coolant into the radiator until near the top. Squeeze coolant hoses gently to help expel air pockets.
7. Bleed air from the system:
   • With the radiator cap off, start the engine and let it idle.
   • Watch for bubbles as air escapes. As the thermostat opens, the coolant level may droptop off as needed.
   • Once all bubbles are gone and the level is steady, shut off the bike and install the radiator cap.
8. Check for leaks and test ride. Inspect all connections. Take a short ride, let the engine cool, and recheck coolant leveltop off if necessary.

Pro Tips for 2018 FE450HQ Owners

• Stick to the OEM coolant change intervalusually every two years or 2,000 miles, but more frequent changes are recommended for riders in harsh or muddy conditions.
• Regularly inspect radiator guards and hoses. The FE450HQ's OEM radiator is vulnerable to debris on tough trails.
• Keep an eye on your engine temp warning light. Frequent overheating could indicate a clogged radiator or impeller issue unique to high-performance off-road Husqvarnas.

Maintaining your 2018 FE450HQ's cooling system is straightforward with the right approachand proper MotoSport-sourced parts. This helps preserve your engine's power, reliability, and overall performance on any adventure.

Related Shopping Categories

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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.