How to Change the Coolant in a 2007 Husqvarna CR125: Step-by-Step Guide

Shop parts for a 2007 Husqvarna CR125 Dirt Bike.

Regular coolant maintenance is essential for the long-term performance & reliability of your 2007 Husqvarna CR125. This classic two-stroke dirt bike relies on a robust cooling system to handle aggressive riding – preventing overheating and damage. Follow these MotoSport-exclusive directions for a safe, effective coolant change specific to your CR125.

What You Need

  • Fresh engine coolant (glycol-based, pre-mixed or mixed with distilled water as recommended)
  • Drain pan
  • 8mm & 12mm socket/wrench
  • New copper crush washer (recommended)
  • Funnel
  • Rag or paper towels for cleanup
  • Protective gloves

Before You Start

  • Allow your CR125 to cool completely before service to avoid burns or injury.
  • Position the bike on a stable stand on a level surface.

Step 1: Remove the Radiator Cap

  • Locate the radiator on the left side of the bike.
  • Slowly open the radiator cap to relieve any pressure.

Step 2: Drain the Old Coolant

  • Position a drain pan under the water pump area (lower right side of engine).
  • Using your wrench, remove the water pump drain bolt (usually 8mm or 12mm).
  • Let all coolant flow out completely. Removing the radiator cap first helps coolant flow faster—avoid contact with skin and dispose of old coolant responsibly.
  • Check the copper crush washer on the drain bolt. Replace it if worn or damaged.
  • Reinstall and torque the drain bolt to manufacturer spec, typically around 10 Nm.

Step 3: Flush the System (Optional, Recommended for Old or Contaminated Coolant)

  • For a thorough flush, remove the lower radiator hose and use compressed air or distilled water to clear out any remaining coolant and debris.
  • Do not use tap water, as impurities can impact cooling system health.
  • Reinstall the hose securely.

Step 4: Add New Coolant

  • Using a funnel, carefully pour fresh coolant into the radiator until full. If using concentrate, mix only with distilled water as specified.
  • Gently rock or tap the bike to release trapped air bubbles.
  • Check the overflow tank (if equipped) and top off as needed.

Step 5: Bleed & Re-check

  • Start the engine and let it idle for a few minutes with the radiator cap off to help air escape. Monitor for air bubbles and ensure coolant level remains steady.
  • Shut the bike off, let it cool, and re-check the coolant level. Top off if necessary.
  • Securely reinstall the radiator cap.

Step 6: Inspect for Leaks & Ride

  • Quickly inspect all hoses, clamps, and the drain bolt for coolant leaks.
  • After your next ride and cool down, check levels once more and add coolant if needed.

Things Every 2007 Husqvarna CR125 Owner Should Know

  • Keep a close eye on coolant levelsthe CR125's two-stroke engine is high-strung, and overheating risks permanent damage to your top end.
  • Inspect radiator hoses and connections for age or cracks every season, especially after hard rides or crashes.
  • Some owners report issues with water in the oil due to vent hosesensure they are routed correctly and regularly checked for blockages or shortness for your engine's health.
  • Change coolant yearly or after operating in muddy, sandy, or high-heat environments for best protection.

Follow this MotoSport guide for reliable cooling performance every ride. Your 2007 CR125 is a legendary, race-proven machine—keep it running strong so you can explore every berm and jump with confidence.

Related Shopping Categories

Shop Radiators for a 2007 Husqvarna CR125 Dirt Bike.

Shop Coolant for a 2007 Husqvarna CR125 Dirt Bike.

Shop Temperature Sensors for a 2007 Husqvarna CR125 Dirt Bike.

Shop Tools for a 2007 Husqvarna CR125 Dirt Bike.

Shop Radiator Hoses for a 2007 Husqvarna CR125 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.