I completely took it apart and checked everything. Its farily new so the compression is great. and everything was clean. I put it back together and it still did it. It seems to take off fast then bog down midway through the powerband. then speeds back up. Richening makes it better but Im at damn near 3 turns now and just being anywhere near it it burns your eyeballs out and makes your throat burn. and when you take off it leaves a trail like a fog machine. but then if I lean it it starts bogging and it still blows craploads of smoke. I have no idea what it is. it almost seems like its somewhere other than the motor, but everything moves freely I had the exact same motor in a one speed and it was fine so i dont know.