Our 07 Gravely came with a 23hp Kawi and almost every time I start it it fills the trailer with smoke, with the choke on or off. The dealer said this is normal due to the muffler being at the bottom of the motor. He said the un-burnt fuel gather's there and when I start it back up it blows it out Ive tried shutting it off at 1/2 throttle, 3/4 throttle and a barley running throttle and nothing makes a difference. Any one else have this same problem? I checked the oil and it is where it should be so it doesn't seem to be burning oil but by the looks of the smoke you would think it was down half a quart.