Honda 450X 2005 Owner's Manual & Competition Handbook page 54

Coolant
Cooling System Bleed Air
1. Remove the radiator cap (1).
2. Fill the system with the recommended coolant
through the filler opening up to filler neck (2).
Use a fresh recommended coolant mixture
(page 48).
Capacity: 1.28 US qt (1.21 )
(1) radiator cap (2) filler neck
50
Servicing Your Honda
3. Remove the radiator reserve tank cap (3) and
fill the reserve tank to the UPPER level line
(4).
(4)
(1)
(3) radiator reserve tank cap
(2) (4) UPPER level line
(3)
4. Bleed air from the system as follows:
• Shift the transmission into neutral. Start the
engine and let it idle 2-3 minutes.
• Snap the throttle 3-4 times to bleed air from
the system.
• Stop the engine and, if necessary, add
coolant up to the proper level. Reinstall the
radiator cap.
• Check the level of coolant in the reserve
tank and fill to the UPPER level if it is low.
NOTICE
If the radiator cap is not installed properly, it
will cause excessive coolant loss and may result
in overheating and engine damage.
5. Install the radiator reserve tank cap.