bigger carburator

a 28mm would be better suited. that 30 will give you room to grow into "porting" "cough" "cough" but its a ok deal you could probably find a new carb for a few nickels more
 
^^Both of those carbs will work, but neither one of them are the desirable Keihin PWK's that everyone likes to run on the Blaster. You can get a good used 28mm Keihin PWK carb from a Yamaha YZ85, or perhaps off another bike. You'll just have to keep looking on ebay and see. The OKO 30mm carb is also a good option and other people here have had luck running them.