So I have have been riding a new metra65 kit, It has about 200 miles on it so it should be pretty close to broken in. I just started taking it WOP and to my satisfaction it has a great brown plug chop and has been jetted so it four strokes very lightly at WOP. twice now, once today and once a few days ago, while riding WOP at probably high forties (which is pretty fast for the 16:45 gearing) the engine seems like it quits four stroking, revs up even higher and sounds like its going to explode. when that happens, I throw in my choke lever and start feathering it (as a test) and the bike does not start cutting out as it should. getting scared I let out from WOP a little and keep feathering the choke as to make sure that I don't soft seize. Then as I'm slowing down I get a loud BRRRRRSZZZZZZZZZZZZZZZZZZPPPP sound and the engine dies as I slow down enough and come to a stop. Is this a soft seize? I have never had one before. Or Is the feathering of the choke causing this to happen? I'm just puzzled because I generally four stroke and have rich plug chops, and ride WOP in the cold of the night, and this happens when it is about 30 degrees warmer.