Small Engines (Lawn Mowers, etc.): small engine problem, carburetor, diaphragm

Question
3.5 Briggs model 91232 type 0061 01 code 93081903
compression 90. The engine is on a go kart. It idles fine and seems to run fine when on choke. Every time I am running engine at high rpm and let off the gas it dies. Any help would be appreciated. Thank you

Answer
You will need to remove the carburetor, and separate it from the gas take, make sure all internal ports are clean and unobstructed. Then replace the gasket between the fuel take and carb, as well as the diaphragm. make sure the pick up tube screen is clean, and the main jet screen, and re-install....Tom