without seeming contradictory i would say the opposite is the problem(in my opinion),if the engine dies when you give it throttle it means the fuel air mix is weak as the first thing the engine gets is a gulp of air when you open the throttle and it should be matched by a gulp of fuel to get the mix right ,when the engine dies like this its because its got no fuel in it ,check the air filter is on the back of the carb properly and if it is then check the carb has no water in as its common on quads to have this problem and if it has no water in it then make sure all the jets are clear in the carb and also that the fuel tap is working properly as these do have vaccum taps on them so make sure all the pipes are connected .also make sure your fuel is fresh and not contaminated with diesel or anything else.good luck with it.
adam bike doctor(of milton keynes motorcycle centre), October 2010