I’ve had my 212 running good for about 6 weeks, and one day when I went to start it up, it would only run when choked - when I would switch it off, the engine would die out. I replaced the carb and checked for any leakage but nothing seemed to work. One thing I should also mention is that the engine seems to start easier when the airbox is loosened a bit, so it may have something to do with that. Any help is appreciated.