As one other poster said check the fuel coming out of the carb. If you have good flow there open the high speed jet a 1/4 to 1/2 turn at a time. If you have low flow there unhook the fuel line at carb, if you have a good steady flow there then you problem is the screen in the carb. whrere the fuel goes in. If you don't have a good flow there take the fuel bowel off and cheack the screen for dirt and also check how much fuel is coming out of the tank. You will find a plug somewhere.