Cute video. Looks like a genset my friend has. There is a compression release lever that you have to push before each pull on pull starter are it will do as in video as it cannot be pull started with it. (poster did not read instructions) As far as flame, if injector pump timing is retarded too much it will after burn in muffler and eventually melt down head too in exhaust port area. If it was over rich it would of had a lot of visible black smoke and when they lean out they smoke blueish. It is quite possible that Honda donated gen sets for PR because it is not cost effective otherwise vs other solutions.