How to Change the Coolant in a 2019 Honda CRF450X
Shop parts for a 2019 Honda CRF450X Dirt Bike.
Maintaining your 2019 Honda CRF450X's cooling system is essential for reliable trail performance and engine longevity. Changing the coolant is a straightforward process that protects your high-compression engine and helps prevent corrosion in the radiators, hoses, and internal passages – a critical maintenance task for the advanced Unicam engine featured in the 2019 model. Follow this MotoSport-exclusive step-by-step guide to keep your off-road machine running at its best.
What You'll Need
- Phillips and flathead screwdrivers
- Socket set (8mm – 12mm)
- Drain pan
- Fresh coolant (compatible with aluminum cooling systems, Honda HP Coolant recommended)
- Soft cloth or shop towels
- Distilled water (if flushing)
- Protective gloves
Preparation
- Ensure the bike is cool to the touch; never open the radiator cap hot.
- Stabilize the CRF450X on a stand or level surface with the engine off and ignition key removed.
Step-by-Step Coolant Change Guide
- Remove the Radiator Shrouds
Use an 8mm socket to remove the shrouds, giving you access to both radiators and the radiator cap. - Remove the Radiator Cap
Gently unscrew the radiator cap to relieve any residual pressure. - Locate the Coolant Drain Bolt
On the right side of the engine case, find the coolant drain bolt (typically near the water pump) – usually a 10mm bolt. Position your drain pan beneath the opening. - Drain the Old Coolant
Loosen and remove the coolant drain bolt. Allow all coolant to drain into the pan. Remove the radiator cap, if not done already, to improve flow. - Flush the System (Optional but Recommended)
If the old coolant is dirty or you want to maximize system protection, pour distilled water into the radiator, then reinstall the bolt and run the engine briefly (do not let it heat fully). Drain and repeat until clear. - Reinstall the Drain Bolt
Inspect the drain bolt washer. Replace if needed (aluminum sealing washers are recommended). Tighten the drain bolt securely, but do not overtighten. - Add New Coolant
Pour new coolant into the radiator slowly, allowing air bubbles to escape. Fill just below the radiator neck lip. - Bleed the System
Tip the bike side to side gently to help vent trapped air. Install the radiator cap. Start the engine and let it idle with the cap on for a couple minutes, then shut it off and let the bike cool. - Top Off as Needed
Once cool, remove the radiator cap and check the coolant level. Add as necessary, reinstall the cap, and clean up any spills. - Reinstall the Shrouds
Reattach the radiator shrouds securely using your 8mm socket.
2019 CRF450X Coolant System Considerations
- The 2019 CRF450X uses a dual-radiator setup with an advanced Unicam cylinder head, demanding high coolant efficiency.
- If you ride in extreme heat or extended slow speeds, consider routine checks – the system is robust but not immune to overheating under hard trail use.
- Inspect hoses and clamps for leaks or soft spots each time you perform a coolant change.
- Always use coolant meant for aluminum motorcycle engines to avoid internal corrosion and pump seal damage.
- If your model is equipped with a coolant temperature sensor or aftermarket fan, verify connections and sealing torque (OEM is 18 ft-lbs for sensor crush washer).
Pro Tips
- Document coolant change intervals; most riders swap coolant every 12 months or after a season of hard trail use.
- If you race or ride in harsh terrain, consider upgrading to high-performance coolant and reinforced silicone hoses for extra reliability.
Performing regular coolant changes on your 2019 Honda CRF450X preserves engine power, prevents premature wear, and supports the long-term value of your bike. Stay trail-ready with MotoSport's exclusive guides and premium parts selection.
Related Shopping Categories
Shop Radiators for a 2019 Honda CRF450X Dirt Bike.
Shop Coolant for a 2019 Honda CRF450X Dirt Bike.
Shop Temperature Sensors for a 2019 Honda CRF450X Dirt Bike.
Shop Tools for a 2019 Honda CRF450X Dirt Bike.
Shop Radiator Hoses for a 2019 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.