How to Change the Coolant in a 2019 Honda CRF450RWE

Shop parts for a 2019 Honda CRF450RWE Dirt Bike.

Routine coolant changes help your 2019 Honda CRF450RWE run cooler – and avoid premature wear. While the process is straightforward, paying attention to a few model-specific details ensures the job is done right. Here is MotoSport's proprietary step-by-step guide tailored for your bike:

Preparation

  • Allow the bike to cool completely. Never open the radiator cap when hot—coolant under pressure can cause burns.
  • Position the bike on a stable stand with the front wheel straight.
  • Have a drain pan, clean rags, and the correct type of Honda-approved coolant on hand.
  • It is recommended to use gloves. Wear eye protection if splashing might occur.

Draining the Old Coolant

  • Remove the radiator cap to relieve any system pressure.
    Note: The cap is located on the right radiator. Push down and twist counterclockwise.
  • Locate the coolant drain bolt on the right side of the engine, by the water pump cover. Place a drain pan underneath.
  • Remove the drain bolt using a 10mm wrench. Some models also have a small copper crush washer—inspect and replace if damaged.
  • To expedite draining, gently tilt the bike from side to side. Once fluid stops, reinstall the drain bolt and torque to factory specs.
  • If equipped, also drain the coolant reservoir by removing the small hose at the bottom of the tank or unbolting the tank itself.

Filling with Fresh Coolant

  • Slowly pour pre-mixed coolant into the radiator until it reaches the filler neck. Only use coolant recommended for aluminum radiators and off-road motorcycles.
  • Replace the reservoir cap and reconnect any hoses you removed.

Bleeding Air from the Cooling System

  • With the bike upright, start the engine and let it idle for several minutes with the radiator cap off. Watch for air bubbles escaping from the filler neck as the thermostat opens.
    This step is essential for the CRF450RWE, which features tight cooling passages and is sensitive to air pockets.
  • Gently rev the engine a few times to help purge air. Top up coolant as needed during this process.
  • Once coolant level stabilizes and air bubbles subside, stop the engine and install the radiator cap securely.
  • After the bike cools, re-check the coolant level in the radiator and reserve tank. Top off if needed.

Key Model-Specific Reminders for the 2019 CRF450RWE

  • Only use premixed, silicate-free coolant approved for aluminum racing radiators and Japanese bikes.
  • The 2019 Honda CRF450RWE features a high-performance cooling system. Be sure the radiator caps and all hoses are properly secured after servicing—even a minor leak can compromise performance under heavy load.
  • Inspect the radiator for mud, grass, or bent fins before and after coolant service. Proper airflow is critical for this model.
  • If you ride aggressively or in hot climates, consider inspecting the coolant more frequently. This particular year and model is performance-tuned and can run hotter than a standard trail bike.
  • Dispose of old coolant responsibly; never pour coolant onto the ground or down household drains.

Proper coolant changes keep your CRF450RWE running at peak performance. For more parts and upgrades to fit your exact bike, Shop parts for a 2019 Honda CRF450RWE Dirt Bike.

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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.