How to Change the Coolant in a 2016 Husqvarna TC125

Shop parts for a 2016 Husqvarna TC125 Dirt Bike.

Routine coolant changes are essential for maintaining optimal engine temperature and performance in your 2016 Husqvarna TC125. A fresh coolant flush ensures efficient cooling, helps prevent overheating, and increases the longevity of vital engine components. The process is straightforward, but several Husqvarna-specific details will make the job easier for TC125 owners.

Why Changing Coolant on the TC125 Matters

The TC125 is a remarkably high-revving two-stroke with a lightweight chassis and advanced cooling system. Consistent coolant replacement ensures peak power delivery and protects aluminum components from corrosion – especially important since 2016 models often see intense riding conditions. Keeping the system free from air pockets or debris is critical to prevent hot spots and avoid premature top-end wear.

Tools & Supplies You Will Need

  • New coolant (aluminum-compatible, non-silicate, pre-mixed for dirt bikes)
  • 8mm or 10mm socket or wrench (for the drain bolt)
  • Phillips screwdriver (to remove radiator shrouds if needed)
  • Clean funnel
  • Drain pan
  • Rags or shop towels
  • Torque wrench (recommended for re-installing bolts to spec)

Step-by-Step Coolant Replacement

  1. Allow the bike to cool completely. Never open the radiator cap on a warm or hot engine, as pressurized hot coolant can cause burns.
    – Place the bike on a level surface or a stand for stability.
  2. Remove the radiator cap.
    • Locate the cap on top of the left radiator. Open slowly to release any residual pressure.
  3. Access and remove the coolant drain bolt.
    • Locate the coolant drain bolt, typically at the bottom left side of the cylinder or water pump area.
    • Position your drain pan beneath the bolt and fully remove it to let old coolant flow out.
    • Replace and tighten the drain bolt once the flow stops (consult your owner's manual for exact torque – generally hand tight plus a slight turn is sufficient).
  4. Flush the system if needed.
    • If the exiting coolant is dirty or contaminated, fill the radiators with distilled water and repeat the draining process. Do not use tap water to avoid mineral deposits.
  5. Refill with fresh coolant.
    • Using a funnel, carefully pour new coolant into the radiator fill neck until it reaches the top. The 2016 TC125 typically takes about 0.7 liters.
    • Some models feature a small bleeder screw near the top of the cylinder or water pump. Loosen this screw as you fill until coolant seeps out, confirming all air is purged – then retighten.
  6. Secure the radiator cap and inspect for leaks.
    • Replace the cap and wipe down any spills.
    • Start the bike and let it idle for a few minutes with the radiator cap on. Watch the temperatures and check for leaks or warning lights. Shut off and recheck coolant level once cool, topping off as needed.

Special Details for the 2016 Husqvarna TC125

  • The 2016 TC125 shares its cooling system architecture with certain KTM models but may have slightly different drain bolt sizing – check your exact fitment before starting.
  • Avoid overfilling; excess coolant will simply escape via the overflow as the system heats and expands.
  • Always use coolant that is compatible with magnesium/aluminum cooling systems to prevent galvanic corrosion.
  • Inspect the radiator fins and ensure they're clear of debris before finishing the job to maximize airflow and cooling efficiency.

Maintaining Your TC125 Cooling Performance

Because the 2016 TC125 excels in aggressive track and trail environments, maintaining its cooling system is a must. Address leaks, cracked hoses, or cap failures as soon as detected to avoid overheating. Consider upgrading to high-performance coolant for added insurance in extreme conditions.

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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.