How to Change the Coolant in a 2017 Honda CRF450R

Shop parts for a 2017 Honda CRF450R Dirt Bike.

Routine coolant changes are essential for keeping your 2017 Honda CRF450R running at peak performance on any track or trail. Here is a proprietary MotoSport guide to completing this maintenance safely and efficiently, including special notes for your specific model.

What You Need

  • Fresh glycol-based motorcycle coolant
  • Socket set with a 10mm socket
  • Drain pan
  • Distilled water (for flushing, if desired)
  • New washer for drain bolt (recommended)
  • Gloves – and eye protection

Step-by-Step Coolant Change Process

  1. Engine Cool – Safety First:
    Make sure your CRF450R engine is completely cool to avoid burns or pressure release injury. Never open the radiator cap while the engine is hot.
  2. Prep the Bike:
    Prop the bike securely on a stand or level surface.
  3. Access the Radiator:
    Remove the radiator cap to allow air in and enable fluid to drain smoothly.
  4. Locate and Remove Coolant Drain Bolt:
    The drain bolt is located on the water pump (lower right side of the engine). Place a drain pan underneath and remove the bolt using a socket. Let all coolant completely drain out[2].
  5. Inspect – Clean – Replace Components:
    Check the removed drain bolt and washer; replace the washer if worn or bent. Inspect hoses and radiator for cracks or damage. If coolant was especially dirty, flush the system with distilled water and drain again.
  6. Reinstall Drain Bolt:
    Fit the drain bolt with a new washer and torque to 10 Nm[2].
  7. Refill with New Coolant:
    Use a funnel to pour fresh coolant slowly into the radiator until it reaches the bottom of the radiator filler neck. The system capacity is approximately 1.09 US qt (1.03 L) for a change[4].
  8. Bleed Air from the System:
    With the cap still off, gently rock or tip the bike side-to-side to release trapped air bubbles. Top off coolant as air escapes.[3]
  9. Secure the Radiator Cap:
    Reinstall the cap securely. An improperly fitted cap can cause overheating and coolant loss[4].
  10. Run and Inspect:
    Start the engine and let it warm up until the cooling fan cycles (if equipped). Shut off and let cool, then recheck coolant level, topping up as needed.

Model-Specific Notes for the 2017 CRF450R Owner

  • The 2017 CRF450R features a high-performance, close-fitting radiator system designed for racing cooling demands.
  • Be vigilant about leaks, especially from the water pump weep hole, as seal failure could signal a need for service.
  • Use the correct coolant type. Avoid automotive coolant with silicates, as it can cause premature water pump wear.
  • Check hoses, overflow, and radiator mounts for damage and be sure airflow is unobstructed by mud or dirt.

Service Tips

  • Change coolant at least once a year or after any event that may have caused overheating.
  • Always use distilled water for mixing (if using concentrate) to prevent mineral scaling inside the radiator.
  • Dispose of old coolant responsibly – keep it away from pets and water sources as it is toxic.

Maintain your Honda CRF450R with pride – a fresh coolant system means maximum power and reliability on every MotoSport adventure.

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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.