Does carburetor cleaner effect/deteriorate rubber carb parts?

Before I started this project, all worked well with the primer. It would draw from the gas tank, fill the bulb and discharge back to the tank with ease. The engine would start, but would only run with the chock 3/4 engaged, then not at all as it heated up. There are no adjustments on the carburetor. So I went about to clean the carburetor, a walbro wyl-167 carb (MTD 753-04296) with GUM-OUT CARBURETOR + CHOCK canned pressurized carb cleaner. All cleaned up well, but after reassembly, the primer had trouble. It would pressurize, but it would not let the pressure return to the gas tank. After a bulb push or two, it would pressurize hard enough that you could no longer push the bulb in. I would expect that the return valve / flapper was stopping it, but I did not move any of the gaskets internal to the carb that make up the passageways and one-way valves, just squirted cleaner through the holes and passages.

Upon diss-assembly a second time, the internal, button type, rubber/noeprene check valve, (not the flapper check valves), seemed soft and mushy and the insert flange portion tore off with very little pressure, almost none.

Has anyone had problems with carb cleaner deteriorating the rubber / neoprene parts that form o-rings and such inside of a carburetor?



Troy built TB425CS with four stroke engine.

Thanks Rex