[dieselmec420]

I recently bought a 1986 ninja zx600r, this thing will crank and crank and wont start with the electric start, put it in second, push it, let out the clutch and give it full throttle and it will start right up and then just rev it up a little and it will run and idle fine. After you get it started by pushing it ,its fine and when you shut it off will start back up with the electric start, but it seems if you let it sit for more than 4 hours or its cold it wont start with the electric start. It smokes just a little when you rev up to about 9000rpms. I'm not sure whats wrong with it though. This is my first bike and would like to get it running so its reliable.Timing chain?rings?kickstand safety kill switch?carburetor? Anybody have any ideas? Thanks