Before you buy a core.

Check the pictures out closely and ask the seller questions.
The throttle may not be stuck but there could be too much play in the shaft.
These carburetors are old and may have a lot of usage which means wear.
Don't mean to scare you but how good are you at doing a rebush? Got the machining tools?
Notice the picture of the air horn fuel inlet looks like sealant but could be stripped threads (a common rookie mistake). I would ask.
Also notice the trash or bugs deeper in the inlet. Wonder about the insides?
Such are the woes of the humble carburetor rebuilder.
Attachments
YF Problem.png (308.36 KB, 166 downloads)

Last edited by buoymaker; 02/28/2022 10:50 PM.
"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."