I have a 17-horse power Kawasaki on my bobcat. When ever iv been using the machine and shut it off, I cant restart it for a wile. It wont even fire. When this first started happening last season, it would start, but would run on only one cylinder for a few minutes. Then the other would start firing. Its also very very difficult to start when its cold. I would say about 10 pulls. The engine fires put it wont stay running. Ones its running it runs great. I also want to mention that sometimes when I start it from cold it chokes blue smoke for a few minutes. After the engine stops smoking it burns clean. It doesnt seem to use any oil. It never smokes when I start it warm. If I can get it started. Any ideas to my little problem here?