How to Change the Coolant in a 2000 Husqvarna CR50

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Routine coolant changes are a must to keep your 2000 Husqvarna CR50 running cool and protecting internal components. The CR50 features a small, high-revving two-stroke engine and a compact, pressurized cooling system, making correct coolant service vital for maintaining optimal performance and ensuring longevity.

Tools & Supplies Needed

  • Branded, motorcycle-specific coolant (anti-freeze with anti-rust additive recommended)
  • Distilled water (if required for concentrate)
  • Socket set & screwdriver
  • Shop rags
  • Catch pan for used coolant
  • Replacement sealing washer (for drain bolt)

Step-by-Step Coolant Change Procedure

  1. Ensure a Cool, Stable Bike
    Make sure the engine is completely cool. Never work on the cooling system when the bike is hot—pressurized coolant can cause burns.
  2. Remove the Saddle and Tank (as needed for access)
    Remove the seat by turning the rear fixing counterclockwise. If necessary, remove the fuel tank for better access to the radiator and hoses.
  3. Remove Radiator Cap
    Twist off the radiator cap to release any pressure in the system. This step is crucial before draining.
  4. Drain Old Coolant
    Place your catch pan under the water pump. Remove the drain bolt below the water pump—about half a liter of coolant will drain out. Disconnect the lower water hose if additional draining is required.
    Inspect the drained fluid for debris or excessive corrosion.
  5. Flush System and Inspect Components
    If buildup, flush with distilled water. Inspect hoses (look for cracks/stiffening), clamps, and the radiator itself.
    Straighten any bent cooling fins gently with a small screwdriver for maximum airflow.
  6. Reinstall Drain Bolt
    Replace with a new sealing washer and tighten securely.
  7. Refill Coolant
    Pour new coolant or a 50/50 mix of coolant and distilled water (per label instructions) into the radiator up to the base of the filler neck.
  8. Bleed and Heat Cycle
    Gently rock the bike to free any trapped air bubbles. Start engine and briefly blip throttle several times with the radiator cap off to finish bleeding air.
    Run engine until up to operating temperature, then shut off and allow it to cool fully.
  9. Top Off and Final Checks
    After cooling, check the coolant level in the radiator and reservoir. Top off as needed. Ensure the radiator cap is secure.

Important Notes for CR50 Owners

  • Coolant Capacity is Limited– Overfilling increases pressure and risk of leaks. Fill only to the filler neck base.
  • Always Use Quality Coolant– Use branded anti-freeze with anti-rust, never hard tap water as minerals cause deposits and cooling issues.
  • Check Hoses and Seals– The compact cooling system relies on perfect seals. Replace old or cracked hoses to prevent leaks or overheating.
  • Clean Radiator Fins Regularly– Blocked fins diminish cooling. Wash gently with a soft jet of water, not high pressure.
  • Observe After Service– After first ride, recheck coolant levels in both radiator and overflow reservoir. Tiny drops in reservoir level are normal as any air is purged during cooling cycles.
  • Never Run the Engine Indoors– CR50 two-strokes emit carbon monoxide.

Why Regular Coolant Maintenance Matters

A fresh coolant service helps protect your CR50 from overheating, corrosion, and long-term wear. Failure to maintain the cooling system can result in internal engine damage, loss of power, and expensive repairs. Make coolant checks and changes part of your regular maintenance schedule for reliable performance and safe riding.

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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.