Do you have the fuel line on the right nipple on the carb?

Some carbs have 2 nipples coming out. 1 for pressure pulses from the engine. And 1 for fuel.

If you hooked your fuel/clunk line up to the nipple thats reserved for pressure pulses--that could explain the problem.

Not sure if your carb is designed like this or not. Some carbs just have a hole in the base and take the pressure pulses from the cylinder through a machined hole.

Did you take the carb off? Did you put it back on the right way?

If you took it off--and it has the little machined hole in the base for the pressure pulses---then the hole needs to line up with the hole in the reed block or cylinder to get the proper pulses.