How to Change the Coolant in a 2002 Husqvarna CR50

Shop parts for a 2002 Husqvarna CR50 Dirt Bike.

Proper coolant maintenance is vital to keep your 2002 Husqvarna CR50 running at its best – overheating can quickly damage the high-performance engine. This guide walks you step-by-step through changing the coolant, with expert tips so you can tackle the job confidently.

Prepare Your Workspace

  • Park your CR50 on a flat, stable surface and ensure the engine is cold.
  • Gather tools: an 8mm wrench, a large drain pan, fresh coolant formulated for dirt bikes (glycol-based, silicate-free), clean rags, and a funnel.

Drain Old Coolant

  • Locate the drain screw at the water pump on the right side of the bike.
  • Position your drain pan under the water pump.
  • Use the 8mm wrench to loosen and remove the drain screw. Allow coolant to flow out completely.
  • Slowly open the right-hand radiator cap to allow air in – this speeds draining. Do not open the cap when the engine is hot to avoid scalding.
  • Inspect the aluminum sealing washer on the drain screw for damage and replace if needed.

Flush the System (Optional for Thorough Cleaning)

  • Once drained, flush with distilled water to help remove residues. Reinstall the drain screw, fill with water, run the engine briefly, then repeat the drain steps above.

Refill with Fresh Coolant

  • Make sure the drain screw is in place and tight, using a new sealing washer for best results.
  • Carefully pour the recommended coolant into the radiator using a funnel. Stop when the fluid reaches the base of the filler neck.
  • If possible, tilt the bike slightly to help trapped air find its way out.

Eliminate Air Bubbles

  • Start the engine and let it idle until warmed – this helps release any air pockets in the system. Watch the coolant level and top off if needed.
  • Let the engine cool, then recheck the level. Add more coolant to keep it at the filler neck base.

Inspect Hoses and Clamps

  • Regularly check rubber hoses for cracks, swelling, or hardness – damage can lead to leaks and engine failure.
  • Make sure all clamps are securely tightened.

CR50 Model-Specific Notes

  • The CR50’s compact engine means proper coolant circulation is critical – any leaks or air ingress can quickly cause overheating.
  • Always replace the O-rings at the head and cylinder joint when reassembling for maximum sealing integrity.
  • Unlike larger Huskies, the CR50 may lack a fan so coolant quality and hose health are especially important.

Tips for Long-Term Reliability

  • Use only high-quality coolant designed for two-stroke dirt bikes – do not use automotive coolant containing silicates.
  • Consider upgrading to a high-pressure radiator cap with a temperature gauge to monitor engine temp and raise the boiling point, reducing boil-over.
  • Service intervals: Refresh the coolant every 12 months or 25 hours of use, whichever comes first.

By following these instructions, you'll maintain your CR50's cooling system and enjoy more trail time with less worry about overheating or leaks.

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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.