I am using a JD 40W? 1950's model and it started sputtering like it was starved for fuel and quit running. It has spark and has fuel going to carburetor. I can spray carb cleaner in the bottom air intake and it will start for a few seconds. My thought is the carb is clogged somewhere in between. What is involved in disassembling and cleaning the carb? Can it be done w/out a carb rebuild kit or will the gaskets not be reusable? Thanks