finally got down the pattern for starting my bike with the kick starter and it starts, runs and idles with choke on. after about 2nd kick and i let it sit for about 5-10mins to warm up since it is about 25-40 degrees Fahrenheit here at nights. After i feel or at least i think its warm i will go to switch the choke off and it presume to die? why does it do this??? please any help greatly appreciated.