How to Change the Coolant on a 2021 Husqvarna TC85BW
Shop parts for a 2021 Husqvarna TC85BW Dirt Bike.
Keeping your 2021 Husqvarna TC85BW running cool is crucial for performance and engine longevity. Coolant replacement is a straightforward but essential maintenance task that prevents overheating and protects the internal water passages from corrosion. Follow this MotoSport-exclusive guide for your TC85BW's best care—and take note of special details unique to this model.
What Makes the 2021 TC85BW Unique?
- The TC85BW (Big Wheel) features larger wheels and a high-output 2-stroke engine designed for competitive youth motocross, which means top cooling performance is critical.
- The cooling system uses a pressurized radiator and a bleeder screw on the cylinder head to ensure all air is bled out—don't skip this step for optimal cooling.
- Always use recommended ethylene glycol-based coolant formulated for aluminum engines.
Tools & Supplies Needed
- Suitable ethylene glycol motorcycle coolant (pre-mixed or mix with distilled water as specified by Husqvarna)
- Phillips and flat screwdrivers
- Socket set (primarily 8mm or 10mm for radiator shroud and drain bolt)
- Shop towels
- Catch pan
- Protective eyewear and gloves
Step-by-Step Coolant Change Procedure
- Cool the Bike: Ensure the TC85BW is cold to avoid burns.
- Remove Protective Covers: Take off the right radiator shroud for best access. Use a socket or screwdriver as needed.
- Open Radiator Cap: Twist off the radiator cap to break the seal and allow the system to vent. This step is critical for smooth draining.
- Drain the System: Place the catch pan beneath the water pump. Remove the coolant drain bolt—typically found on or near the water pump cover. Allow several minutes for the coolant to thoroughly drain.
- Replace and Secure: Reinstall and tighten the drain bolt gently. Overtightening can strip the aluminum threads.
- Flush (Optional): If coolant is dirty or the bike has been used in abrasive environments, pour a small amount of distilled water into the radiator, reinstall the drain bolt, and repeat the drain step. Replace the bolt after flushing.
- Refill Coolant: Slowly add fresh coolant into the radiator filler neck until it just reaches the bottom of the neck. Do not overfill.
- Bleed the System: Locate the small bleeder screw at the top of the cylinder head. Loosen the screw slightly until coolant (not air or bubbles) seeps out, then tighten securely. This step is vital for the TC85BW to prevent hot spots and airlocks.
- Top Off: Recheck and top off coolant if needed. Clean any spilled coolant immediately.
- Reassemble Protective Covers: Replace the radiator cap, then reinstall all shrouds securely.
- Warm-Up & Final Check: Start the engine, let it reach operating temperature, and inspect for leaks. Allow the bike to cool down, then recheck and top off the coolant again.
Troubleshooting & Tips Specific to TC85BW Owners
- Bleeder Screw: Always use the cylinder head bleeder screw on the TC85BW—skipping this step can result in trapped air.
- Check Radiator Fins: Clean and straighten radiator fins for best airflow. Bent fins should be carefully straightened, as the TC85BW's narrow radiators are prone to packing with mud or debris.
- Coolant Choice: Use only compatible motorcycle coolants. Never mix coolant types, and avoid tap water mixing due to minerals that can corrode the system.
- Regular Checks: Inspect your coolant before each ride. Minor leaks can quickly become major problems, especially with the high-output engine.
Stay Race Ready
A properly serviced cooling system keeps your 2021 Husqvarna TC85BW on track and off the sidelines. Consistent coolant changes and attention to the unique needs of the TC85BW ensure maximum performance all season long.
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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.