Well I have my 3.5 HP B&S engine and carburetor rebuilt. I have got it running, also. I have started the engine and adjusted the carburetor and it runs really well. However, when I put the air filter on top of the carburetor the engine chokes and cuts off. Also, my engine is on my tiller and if I engage the clutch (without the air filter) and try to till with it the engine cuts off.
Any idea what is wrong? The carburetor is a late pulsa jet.
What did you set the mixture screw at when you reassembled the carb? Did you replace the pump diaphram? Did you install the spring and cup under the diaphragm in the correct order? Did you install a new gaskets between the carb and tank? Did you install a new air filter? These are all things that can be the cause of your problems.
