How to Change the Coolant in a 2017 Husqvarna TC125
Shop parts for a 2017 Husqvarna TC125 Dirt Bike.
Maintaining the cooling system on your 2017 Husqvarna TC125 is crucial for reliable engine performance – especially during demanding rides. Below you will find a proprietary step-by-step guide from MotoSport for safely changing the coolant and ensuring your TC125 stays in optimal condition.
What Makes the 2017 Husqvarna TC125 Radiator System Unique?
The 2017 TC125 uses a high-capacity, closed-loop liquid cooling system with radiators specifically designed for high-output two-stroke engines. Factory specs require the use of high-quality, non-silicate, phosphate-free coolant to protect delicate magnesium components inside the water pump and ensure the system is protected from corrosion and overheating. The 2017 model's compact radiator network and water pump design enable more efficient cooling, but also require careful bleeding to avoid air pockets after service.
Tools & Supplies Needed
- Fresh coolant approved for two-stroke motocross bikes (avoid silicate-based formulas)
- Socket set (for removing water pump drain screw and radiator cap)
- Drain pan/container (to catch old coolant)
- Shop towels or rags
- Gloves – optional, but recommended
Step-by-Step Instructions for Changing Coolant
- Allow the Bike to Cool: Never open the radiator cap while the engine is hot. Wait until completely cool to prevent burns from pressurized steam.
- Locate the Radiator Cap and Water Pump Drain Screw: The radiator cap sits at the highest point of the radiator, typically on the left side. The drain screw is found on the water pump cover, located low on the right side of the engine near the bottom of the clutch cover.
- Position the Bike for Draining: To help the system drain fully, lean the bike onto its side stand. Place a drain pan underneath the water pump area to catch used coolant–avoid spills on your shop floor or driveway.
- Remove the Radiator Cap: Unscrew the radiator cap to allow air in, which helps the coolant drain more efficiently.
- Remove the Water Pump Drain Screw: With your drain pan in place, loosen then remove the small drain screw from the water pump cover. Coolant will begin to flow out. Once draining stops, you may gently rock the bike or remove the lower radiator hose if needed for a complete flush. Inspect the old coolant – milky coolant could indicate other maintenance is needed.
- Reinstall the Drain Screw: Once coolant is fully drained, replace and tighten the water pump drain screw securely. Do not overtighten, as the cover is made from magnesium alloy.
- Refill With Fresh Coolant: Slowly pour the new coolant into the radiator until the fluid level reaches the bottom of the fill neck. Pause if you see bubbles or rapid draining. Fill in stages to minimize trapped air.
- Bleed Any Air From the System: Before reinstalling the radiator cap, gently rock the bike side to side several times. Watch for air bubbles. On some 2-stroke models, you can crack a secondary bleeder screw on top of the cylinder head for better bleeding – confirm on your machine before attempting.
- Secure the Radiator Cap: Confirm fluid level is correct at the fill neck, then replace and tighten the radiator cap.
- Start and Recheck: Start the bike and allow it to idle for several minutes, occasionally blipping the throttle. Turn off the engine, let it cool, and check coolant level again. Top up if needed.
Maintenance Tips Specific to the 2017 TC125
- Always use a coolant designed for modern two-stroke off-road engines, as magnesium parts are susceptible to corrosion when exposed to conventional automotive coolants.
- Avoid using tap water to dilute coolant – distilled water is recommended if you need to mix.
- Inspect the radiator hoses and clamps for leaks and fatigue when changing coolant. Replace as needed for preventative maintenance.
- If you ride in extreme temperatures, consider a performance coolant for better high-heat protection.
- Regularly check radiator fins for damage or debris that can affect cooling efficiency.
Conclusion
Routine coolant changes are a key step in prolonging engine life and maintaining the performance edge of your 2017 Husqvarna TC125. Following these proprietary MotoSport instructions ensures you protect sensitive internal engine parts and keep your MX machine ready for action.
Related Shopping Categories
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Shop Tools for a 2017 Husqvarna TC125 Dirt Bike.
Shop Radiator Hoses for a 2017 Husqvarna TC125 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.