How to Change the Coolant in a 2020 Husqvarna TC125
Shop parts for a 2020 Husqvarna TC125 Dirt Bike.
The 2020 Husqvarna TC125 is a high-performance 2-stroke motocross bike, designed to keep weight down while maximizing speed and agility. Proper cooling system maintenance is essential to ensure optimal power delivery and engine protection. Here is a step-by-step, MotoSport-exclusive guide to confidently changing the coolant on your TC125.
Tools & Supplies Needed
- Fresh, model-appropriate coolant. Always use high-quality coolant rated for aluminum engines.
- Socket or Torx wrench set (to fit drain bolt – usually on the water pump cover).
- Drain pan or suitable container.
- Rags or shop towels.
- Funnel for precise pouring.
- Safety gloves and eye protection.
Step-by-Step Coolant Change Instructions
- Let the Engine Cool: Never attempt to open the radiator cap when the engine is hot. Allow your TC125 to fully cool down to prevent burns or system pressurization.
- Stabilize the Bike: Place your 2020 TC125 upright on a stand for maximum stability and drainage .
- Remove the Skid Plate (if installed): This step is optional but provides better access to the water pump area.
- Place the Drain Pan: Position your pan beneath the lowest point of the cooling system, usually under the water pump cover .
- Drain the Old Coolant:
- Locate the coolant drain bolt on the water pump cover and remove it. Also, unscrew the radiator cap to facilitate full drainage .
- Allow the system to empty completely. Gently rock the bike if needed.
- Reinstall the Drain Bolt: Once the coolant finishes draining, inspect and clean the drain bolt and its sealing washer. Reinstall securely, being careful not to overtighten .
- Fill with Fresh Coolant:
- Slowly fill the radiator with new coolant up to the proper level .
- To fully eliminate trapped air, carefully open the small bleeder screw located on top of the cylinder head while filling (if equipped on your model) . Watch for coolant to appear free of bubbles, then gently re-tighten the bleeder before adding the last bit of coolant .
- Secure the Radiator Cap: Confirm the radiator is topped off and reinstall the cap firmly .
- Check for Leaks: Wipe away any residual coolant and inspect all connections and seals for leaks after refill.
- Start and Cycle the Engine: Let the engine idle briefly, then shut off and check coolant level againsometimes small air pockets escape and levels drop after first run. Top off if needed .
Special Notes for the 2020 Husqvarna TC125
- This model features a compact aluminum radiator and a high-revving 2-stroke engine, making it essential to keep the cooling system at optimal capacity to avoid overheating and potential cylinder or piston damage.
- Routine coolant changes are especially important if you ride in muddy or extreme conditions, as dirt can get into the radiator fins and reduce heat dissipation efficiency .
- Inspect the radiator cap and all hoses for signs of wear at every coolant service, as they are prone to fatigue on vibration-heavy motocross bikes.
- Use only coolants compatible with magnesium and aluminum engine parts to avoid corrosion.
When to Change Your Coolant
- At least once per season, or every 40-50 hours of ride time for optimal engine health .
- Any time the coolant appears dirty, cloudy, or if you suspect contamination from muddy conditions.
- After any major engine service that drains or disturbs the cooling system.
With attentive service and the right parts, your 2020 Husqvarna TC125 will stay cool & ready to rip on any track or trail. If you need OEM or performance cooling system parts, shop parts for a 2020 Husqvarna TC125 Dirt Bike.
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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.