Make sure your bike is on it's side stand so the bike's lean will help with burping. With the radiator cap off, start the bike. I just gently roll the throttle on and off to about 3 or 4k. When your bike reaches about 167F degrees, that's when the thermostat begins to open. You'll see the coolant begin to move a little in the radiator. By about 172F, it's full open and you should see the coolant moving rapidly in the radiator. That's when the bubbles start coming out. The last time I burped my cooling system it took a couple minutes for all the air to work it's way out.