Basically the same thing here.....................

Bike leaves the light or curb very labored and unless you keep the rpm's up considerably it will backfire, cough and spit and sometimes die. When it dies it doesn't want to start right up. Kinda rough in the middle of a traffic circle with your poor scared to death wife on the back thinking she's gonna get run over!!
After the second time this happened I started getting the "added" noise over and above the "usual" and unfortunitly "expected" noise. The noise has no definition, it will come and go as it pleases and at many different rpm's. You can not "make" it come on with any certain twist of the throttle. This thing only has approx. 300 miles on it.
I guess I'll run it up to the stealer for the usual "nothing is wrong" ceremony, if nothing else just to cronicle the issue and have it on file. I'll make them note my displeasure and my concern over this locking up at speed and the possible results of that happening................................................................ or......... maybe they will surprise me

I am quite certain the backfiring is a product of the lean condition but this is rediculas. If they have to kill an engine to meet epa I think they need to start over.