I started my bike the other day and after 30 secs is stalled. Afterwards, it wouldn't start at all. Next day it would start and stall again. However this time if I got it started I could keep it going a little longer if I played with the choke.

 

Has the bike been sitting up for a while? Bad gas, clogged jets?

 

It's been rode regularly so no reason to think it's bad gas or anything clogged.

 

I would start with the big three fuel, air, spark. look at the parts that could effect one of these areas, and work your way to the problem. It sounds like something has come loose or has stopped up or something.