Briggs carb swap?

#1
I have a 3.5 Briggs with a dia. type carb. It's the one with the intake (S shaped) and the carb has a diaphram on the bottom. This thigs has all new parts and I'm have a heck of a time getting it to start and run right when it does start. Is there another route I can go, like a different carb?
 
Top