Doing a slow restore on a 72 240 i picked up. Weber 45s were having some trouble sneezing and leaking so took them off to clean em up and replace gaskets, set floats etc. Noticed these adjustment screws which i find no mention of in Haynes manual, or any online reference ive found. These are the later 152s with nitrophyl/spansil floats so im thinking it was a modification on later models?
has a white plastic hat/cover. one on each throat.
with plastic cover removed
needle screw with fastener nut
needle pokes through main venturu/choke into carb throat (uppe