How to Change the Coolant in a 2021 Husqvarna FC350
Shop parts for a 2021 Husqvarna FC350 Dirt Bike.
Changing the coolant on your 2021 Husqvarna FC350 is a crucial maintenance task to ensure your bike stays cool under pressure, maintains optimum engine performance, and prevents overheating. The FC350 features an advanced, integrated cooling system with aluminum radiators and coolant channels machined directly through the frame, offering superior flow and efficiency compared to many other models–but it still requires regular coolant flushing for peak reliability–especially if you race or ride in extreme conditions–.
What You Need
- Fresh, high-quality coolant (race spec, ideally premixed for aluminum components)
- Drain pan or container
- 8 mm and 10 mm sockets (check your water pump cover bolts)
- Basic toolkit (ratchet, extension, funnel*
- Protective gloves
- Clean water (distilled preferred, for system flush)
Step-by-Step Coolant Change Procedure
- Let The Bike Cool
Always begin with a completely cool engine to avoid burns or pressure spray from the radiator cap. - Access the Radiator Cap
Remove the right side shroud if needed. The radiator cap is on the left radiator. - Release Pressure
Unscrew the radiator cap slowly to release any built-up pressure in the system. - Locate and Remove the Coolant Drain Bolt
Place your pan under the water pump cover (lower right side of engine). The drain bolt is typically identified by a copper washer–remove this bolt and let all coolant drain completely–. - Flush the System (Recommended)
If changing coolant brands or after any overheating, pour clean distilled water into the radiator. Replace the cap, run the engine for a few moments, then drain again. Repeat until clear water flows from the drain. - Reinstall the Drain Bolt
Fit a new copper washer if the old one is damaged. Tighten to manufacturer torque spec (usually around 10 Nm). - Refill Coolant
Place a funnel into the radiator fill neck and pour coolant slowly until full. Squeeze the radiator hoses by hand to help burp out air. - Prime and Bleed the System
Tilt the bike gently from side to side. Allow trapped air bubbles to rise. Top up coolant as needed and replace the radiator cap securely. - Start and Check
With the bike upright, start the engine. Let it warm up to full operating temperature to allow pressure cycling. Shut down, let the engine cool, and recheck the coolant level–add if necessary. - Final Inspection
Wipe away any spills, check for leaks around the drain bolt and hoses, and ensure all shrouds and guards are reinstalled.
2021 Husqvarna FC350 Model Notes
- Integrated cooling: The frame-integrated coolant channels improve stability at race pace by helping dissipate heat more efficiently compared to traditional full-hose systems–check all connection points for leaks after service–.
- Lightweight battery: The electric start system is powered by a compact, lightweight Li-Ion battery–careful not to splash coolant on electrical connectors during your flush.
- Maintenance reminders: FC350's precise hydraulic clutch and high-performance engine mean temperature control is critical–always use coolant recommended for aluminum engines and keep a close eye for any signs of air bubbles or leaks after a flush.
Pro Tips
- Use race-proven coolant types formulated for aluminum and magnesium alloys.
- Inspect all hoses, clamps, and the radiator cap for signs of wear or damage.
- Consider flushing at least once a year for best long-term reliability–especially before major races or long summer rides.
Related Shopping Categories
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Shop Radiator Hoses for a 2021 Husqvarna FC350 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.