How to Change the Coolant in a 2006 Honda CR250

Shop parts for a 2006 Honda CR250 Dirt Bike.

Changing the coolant in your 2006 Honda CR250 is a key maintenance step that ensures your liquid-cooled two-stroke remains running at peak temperatures, especially under the aggressive riding for which this legendary motocross bike was designed. The CR250's lightweight aluminum frame and highly-tuned cylinder mean that even brief overheating can cause trouble. Here is MotoSport's proprietary process for a tidy, thorough coolant change specific to your 2006 Honda CR250.

What You Need

  • Pro Honda HP Coolant or high-quality equivalent (silicate-free, ethylene glycol-based)
  • 10mm socket and wrench
  • Large flathead screwdriver
  • Drain pan
  • Funnel
  • Rag or paper towels
  • New crush washer for the drain bolt (recommended)
  • Safety gloves

Steps to Change the Coolant

  1. Let the bike cool completely: Never open a hot radiator. Allow engine and radiators to cool for at least 30 minutes after running.
  2. Remove the seat and shrouds: To access the radiator cap and hose connections, use your 10mm socket to remove the bolts securing the seat and radiator shrouds.
  3. Remove the radiator cap: Carefully twist off the cap using a rag to prevent any remaining pressure from spraying coolant.
  4. Position the drain pan: Place it under the water pump – on the right side of the engine – where the coolant drain bolt is located.
  5. Remove the coolant drain bolt: Using your 10mm wrench, loosen and remove the drain bolt on the side of the water pump. Allow the old coolant to fully drain into the pan.
  6. Check the washer & bolt: Inspect or replace the crush washer on the drain bolt before reinstalling. Torque the drain bolt to the factory spec (consult your service manual for specifics).
  7. Flush (optional but recommended): Pour some distilled water into the radiator, reinstall the cap, briefly start the bike (just seconds), then shut it off and drain again to flush any debris.
  8. Refill with fresh coolant: With drain bolt back in place, slowly add coolant through the radiator neck. The 2006 CR250 requires about 1.02 US quarts at coolant change. Tilt the bike side-to-side gently to release trapped air bubbles.
  9. Bleed air from the system: With the radiator full, run the bike in neutral with the cap off for a minute to allow bubbles to escape. Top off as needed and then tighten the cap securely.
  10. Reinstall plastics: Replace the radiator shrouds and seat. Wipe down any spilled coolant.

Important Notes for 2006 Honda CR250 Owners

  • The factory radiator cap is designed for precise pressure – ensure it is snugged fully, as leaks here are a common cause of overheating.
  • Use only silicate-free coolant. Silicates can damage the high-speed water pump and fine radiator passages of your CR250, leading to costly repairs.
  • Check all hose clamps and connections for tightness at every coolant change, as vibration can loosen them on this model.
  • Don't mix different coolant types or colors unless compatible – residue or clumping can obstruct flow.
  • Always dispose of old coolant responsibly by taking it to a waste recycling center.
  • If you ride in freezing temperatures, verify your fresh coolant offers adequate anti-freeze protection.

When to Change Your Coolant

Honda recommends changing coolant every two years or whenever it appears dirty or rusty. More frequent changes are advised for riders who race or run long hard moto sessions.

Why Coolant Maintenance Matters on the CR250

The 2006 CR250's RC valve powerband and high-revving engine generate considerable heat. Routine coolant changes help prevent corrosion and preserve optimal performance, extending the life of your engine and its critical seals. An overheated CR250 is at risk for top-end seizure or warped heads – so keep your cooling system fresh.

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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.