How to Change the Coolant in a 2025 Husqvarna TC85: Step-by-Step Guide
Shop parts for a 2025 Husqvarna TC85 Dirt Bike.
Maintaining fresh coolant in your 2025 Husqvarna TC85 is essential for keeping the new Pankl radiator system and high-performance 2-stroke engine running at optimal temperature. The 2025 model is equipped with scaled-down, high-tech radiators previously exclusive to full-size Husqvarna motocross bikes, offering enhanced durability and cooling efficiency for demanding track conditions. Here's how to change the coolant confidently and keep your TC85 ready to race.
What Makes the 2025 TC85 Unique?
- New lightweight Pankl radiators featuring advanced heat dissipation for improved reliability under heavy load.
- Revised cylinder head and ignition system for better torque and a lighter enginekey for aspiring racers who push the limits.
- Aluminum cylinder with an innovative powervalve system delivers strong bottom and midrange power, lessening clutch use in tough terrain.
- Hydraulic clutch and close-ratio six-speed ensure consistent performance with minimal maintenance.
Tools & Supplies Needed
- New coolant recommended for aluminum motocross engines (ethylene glycol-based, non-silicate, or manufacturer-suggested coolant)
- Socket wrench (typically 8mm or as required for your drain bolt)
- Catcher pan (for old coolant)
- Screwdriver (for radiator cap & bleed screw)
- Shop rags
- Gloves and eye protection
Step-by-Step Coolant Change Process
- Make Sure the Bike is Cool.
Never remove the radiator cap when the engine is hot; let the bike cool completely to avoid burns. - Access the Radiator Cap.
Locate and remove the radiator cap on the right side of the TC85's new radiator assembly. - Drain the Old Coolant.
Find the engine coolant drain bolt (usually on the lower right side of the cylinder or the water pump cover). Place a pan beneath and use a socket to loosen the bolt.
Allow all coolant to drain completely. - Inspect & Reinstall Drain Bolt.
Check the drain bolt and washer for damage. Replace if needed.
Torque to manufacturer spec (typically 6-8 Nm for most 85cc engines, but confirm with your service manual). - Flush with Distilled Water (Optional).
For extra insurance, refill with distilled water, run the engine briefly, then drain again to remove debris. - Refill Coolant.
Slowly pour new coolant into the radiator until it's near the top. Do this in stages to avoid air pockets. - Bleed the Cooling System.
For the TC85, locate the small bleeder screw on the top of the cylinder head.
Loosen the bleeder screw until coolant begins to seep out without air bubbles, then retighten.
This process is crucial with the new 2025 head design, as its compact layout can trap air more easily. - Top Off & Check for Leaks.
Fill to the neck of the radiator, reinstall the cap, and wipe away any spills.
Start the engine briefly, rev lightly, then let it cool and recheck coolant level top off if necessary. - Proper Disposal.
Take the old coolant to an appropriate recycling or disposal facility. Never pour coolant onto the ground.
Model-Specific Notes for 2025
- Pankl radiators are more resistant to overheating but require regular inspection for mud and debris during aggressive rides.
- The innovative cylinder head in 2025 can cause air pockets during coolant changes; ensure complete bleeding for optimal engine protection.
- If you ride in extremely cold or hot environments, monitor coolant strength and adjust dilution as needed to prevent freezing or boilover.
Proper coolant changes preserve the TC85's performance edge and longevity–critical with the latest engine and cooling upgrades. Make coolant changes a regular part of your season prep for worry-free riding and racing.
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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.