If you are looking for a carb for a chainsaw like the orange one in the picture those saws were made by Poulan and are Model S25DA and S25CVA (or S25 series) and very good saws, made back when Poulan made very good saws. They were priced at around $150 in the 80's) I have two of them (bright green color) I'm not a Poulan fan but these S25's restored my faith in Poulan made saws. One of mine has electronic ign. My two saws look new but came out of junk piles and I've never had to go into a carb on them and the carb's jets adjust exactly as the should but the fuel lines needed replaced and the little gas tank cap duckbill is usually rotted away. Just use a Homelite duckbill vent. One of mine has the owners manual with IPL. Both of mine start easily with a choke applied, sometimes have to half choke even when the saw is warm.
Really have to keep a heads up installing the air box filter cover to keep from pinching the gas line and
look carefully at the air box area inside.
I had to make some foam or sponge pieces that were rotted away to keep dust from bypassing the air filter and getting into the air box and carb throat.
You have to watch buying used parts for them, some of the flea bay sellers use the word VINTAGE and jack up the price for junk parts. I have few NOS spare S25 parts I've carefully scrounged from flea bay using saved searches using Poulan part numbers, dirt cheap, but no carb's. (the sellers had the part numbers listed from their NOS boxes or plastic bags but the seller did not know what the parts actually fit was how I acquired the lesser priced parts from flea bay.
You can find lots of parts on flea bay if you search using S25 models.
try searching POULAN S25 CHAINSAW CARB ON FLEA BAY or S25 chainsaw and see if any of the pictures look like yours.
Here is a link to some.
A picture of the exact saw you are working on and the carb would help us get more precise with answers????????????
https://www.ebay.com/sch/i.html?_fr....l1313&_nkw=Poulan+S25+chainsaw+carb&_sacat=0