How to Change the Coolant in a 2013 Honda CRF450X

Shop parts for a 2013 Honda CRF450X Dirt Bike.

Changing the coolant in your 2013 Honda CRF450X is an essential part of routine maintenance, ensuring optimal engine performance and preventing overheating on the trails. This unique MotoSport.com guide covers the complete process and details specific quirks for your CRF450X, ensuring your dirt bike stays ready for the toughest journeys.

What You Need

  • Fresh motorcycle-specific coolant (avoid automotive coolants unless specified safe for aluminum and magnesium components)
  • Distilled water (if diluting concentrate)
  • Drain pan
  • Socket wrench and 8mm or 10mm socket (for water pump bolt)
  • New copper washer for drain bolt (recommended)
  • Clean rags
  • Funnel
  • Protective gloves and eyewear

Step-by-Step Coolant Change Guide

  1. Ensure the bike is cool.
    Never attempt to open the radiator when the engine is hot – coolant systems are pressurized and may cause burns.
  2. Remove the radiator cap.
    Locate the radiator on the right side of the CRF450X. Remove the cap slowly to release residual pressure.
  3. Drain the old coolant.
    Place a drain pan underneath the water pump. Using your socket wrench, remove the water pump drain bolt (typically located on the lower right side of the engine case). Allow all coolant to drain completely.
    Tip: Remove the radiator cap before the drain bolt for faster draining.
    Inspect and replace the copper washer on the drain bolt to prevent leaks.
  4. Reinstall the drain bolt.
    Hand-thread, then torque the bolt to manufacturer specification (generally around 10 Nm).
  5. Flush the system (optional but recommended).
    To fully remove old coolant or if switching coolant types, fill the radiator with distilled water, reinstall all caps and bolts, run the engine briefly, then drain. Repeat as necessary until the fluid drains clear.
  6. Fill with new coolant.
    Using a funnel, slowly pour the new coolant into the radiator until it reaches the filler neck. Use pre-mixed coolant or mix concentrate with distilled water as specified.
  7. Bleed air from the system.
    With the bike on level ground, start the engine and let it idle with the radiator cap off. Gently rev to help dislodge air bubbles. If coolant level drops, top off as necessary. Be prepared for minor overflow as the thermostat opens.
  8. Reinstall radiator cap.
    Confirm fluid is at the proper level, then install the cap securely.
  9. Check the reservoir.
    The CRF450X may feature a small overflow tank. Fill to the proper line.
  10. Dispose of old coolant properly.
    Do not pour coolant down household drains or onto the ground. Most auto parts locations recycle used coolant.

Notes – CRF450X Specific Details

  • The 2013 CRF450X is a high-performance off-road model that features aluminum components in the cooling system. Always use coolants rated safe for aluminum and magnesium alloys to avoid corrosion or deposit build-up.
  • Regularly inspect the radiator and hoses for off-road damage. Debris and impacts are common in trail environments—replace worn or damaged parts promptly.
  • If you experience persistent overheating, ensure both radiators are unobstructed and consider a thorough flush or system inspection.
  • Never overfill, as excess coolant will vent through the overflow when the bike reaches operating temperature.

Performing a coolant change yourself on the CRF450X is straightforward and keeps your engine protected against one of the top causes of off-road breakdowns. For OEM replacement parts or high-performance upgrades dedicated to your 2013 Honda CRF450X, MotoSport.com has everything you need for a seamless service experience.

Related Shopping Categories

Shop Radiators for a 2013 Honda CRF450X Dirt Bike.

Shop Coolant for a 2013 Honda CRF450X Dirt Bike.

Shop Temperature Sensors for a 2013 Honda CRF450X Dirt Bike.

Shop Tools for a 2013 Honda CRF450X Dirt Bike.

Shop Radiator Hoses for a 2013 Honda CRF450X Dirt Bike.

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.