This'll sound stupid but did you get all the vacuum lines back on and unkinked? That bike uses vac accuated slides when you hit the throttle. Also,are you sure the carbs are synched and are all the boots tight? Did you make sure to tighten all the caps so no air can get in past the diaphrams? Try spraying carb cleaner around the carbs sides with the bike idling and see if the engine stalls or surges. I know those boots to the intake manifold can be a pain if you don't have the right tools to get in there and tighten them. Not to mention the boots between the carbs and the airbox! I use a flexible extension for that kind of work. Hopefully you snapped the needles back into the carriers snug. Hmmm no offense but is the petcock turned on all the way? Did you check the fuel filter? If you take the air box back off,make sure that the slides move freely back and return closed imediately and approx in the same amout of time. Let me know and I'll check for a service manual for that bike in the database,I do believe it is in there. If not,those are Keihnin (sp) carbs and any Kaw with them will be setup similar. Goodluck!