Choke problems

[ragecage23]

So, I did a little search before this new thread and found nothing, but here's my problem. Early in the mornings when I'm leaving work and its cold outside (well cold for my type of weather [about 35-40° F]) and I apply the choke to warm up the bike it will start warming up like usual, but then the RPMs will go down to idle. However if the choke is taken off the bike, of course, dies. Any ideas?

[HPP8140]

1. ummm....not warmed up
2. tight exhaust valve(s)

[ragecage23]

Even with the choke applied it just idles, almost like it isn't "catching" for lack of a better word.