Changing engine coolant?

[RAPTOR80RACR990]

How do you change engine coolant on a 450R?

[Johnny B]

take the bottem bolt that holds the water pump cover on and the coolent will come pouring out

[JW450R1]

There is a special bleed percedure.
Fill the radiator
Start the engine and let run for 2-3 minutes
Snap the throttle 3-4 times.
Then shut off the motor,let it sit a few minutes and topp off the fluid...That bleeds the air out of the cooling system