How to Change the Coolant in a 2003 Husqvarna CR125
Shop parts for a 2003 Husqvarna CR125 Dirt Bike.
Proper coolant maintenance is crucial for the 2003 Husqvarna CR125—especially given the model's high-revving two-stroke nature and the importance of precise temperature management. Follow this MotoSport proprietary guide to safely change your coolant and keep your CR125 running cool lap after lap.
What You Need
- Glycol-based motorcycle coolant (dilute with distilled water if concentrated)
- Phillips or flat-head screwdriver
- 8mm or 10mm socket and ratchet
- Drain pan
- Rags and gloves
- Torque wrench (to reset drain bolt)
- Replacement copper washer for drain bolt
Preparation
- Ensure the engine is fully cool before starting. A hot cooling system can spray scalding coolant when opened.
- Place the bike upright on a stand for stability.
Draining the Coolant
- Locate the radiator cap (usually on the left side, above the cylinder) and the water pump drain bolt (commonly the lowest bolt on the right-side water pump cover).
- Place your drain pan beneath the water pump.
- Slowly loosen and remove the radiator cap to relieve system pressure and allow air in. This speeds up draining.
- Remove the water pump drain bolt. Let all coolant drain fully.
- Inspect and replace the copper washer on the drain bolt if worn or damaged.
Flushing the System
- If changing coolant types or contamination is suspected, flush the system by briefly removing the lower radiator hose and using compressed air (with a rubber-tipped nozzle) to blow out any residual coolant. Avoid flushing with tap water, as minerals can remain in the system.
Refilling the System
- Reinstall the drain bolt with the fresh washer. Torque it to 10 Nm for a secure seal.
- Pour the recommended coolant slowly into the radiator until it's just below the filler neck. If using concentrated coolant, mix according to manufacturer instructions with distilled water.
- Gently rock the bike or squeeze the radiator hoses to help release any trapped air pockets.
- Wait several minutes, then top off if necessary.
Final Steps
- Reinstall and secure the radiator cap.
- Start the engine and allow it to idle for a few minutes, monitoring for leaks and observing the coolant level. Shut off and recheck/fill if needed.
Special Notes for the 2003 Husqvarna CR125
- This bike is known for its slim build and high-strung engine—meaning heat management is critical for performance and longevity.
- Always use the recommended coolant type for best protection of magnesium engine cases and alloy radiator cores.
- If you notice unexplained coolant loss or milky oil, inspect your radiator cap, water pump seals, and the coolant system for leaks or failures, as these issues are infrequent but possible on older two-strokes.
- Replace the radiator cap if you experience coolant overflowing into the catch tank or out the overflow hose, as this often indicates a worn or weak cap unable to maintain system pressure.
Regular coolant changes are a key part of owning a 2003 Husqvarna CR125. Keep it on your maintenance schedule, and your ride will deliver peak power and reliability season after season.
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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.