my bobcat 500 has a kohler k662 motor with a zenith carburetor 272041. ive taken it apart several times to clean and alway wonder what this little brass cylinder is for that you just drop in a hole in the body. its about 1/4" round and and about 1/4" thick with an R on the side. i've looked ad every diagram that exist and none of them show it. Does anyone have an idea of what it does? Thanks for any reply.
