per the manual, let the bike idle with the radiator cap off for about 2-3 minutes, then blip the throttle a couple of times. You'll see the bubble if it burps.
I've changed mine 4 or 5 times and 3 -/2 Qts is about the most it ever takes. I think the 4 Qt volume is following complete motor disassembly. You can't drain everything out through the drain plug.
You'll be fine.
Yes, I read that procedure, tried it a couple times, only got a few small bubbles. Didn't want to run it very long if I had a big air lock. But it sounds like 3 1/2 US quarts fulls them up.

Thanks