Why is my motorcycle stalling?

Chokes aren't like light switches, either on or off, but more like a dimmer switch. There's nothing wrong with riding a bike with the choke partially on. Personally, I do not and would not ever set there 3-4 minutes waiting for the bike to warm up. I fire them up and in cold weather put my gloves on and then ride off. With partial choke on. It's usually about a mile away before I can turn the choke off completely. As long as you aren't redlining a cold engine, riding it with the engine cold does no damage and in fact, they warm up faster than just setting there. I've always done it that way and my oldest bike has 115,000 miles and the newer on 93,000, so it must not hurt them.