You might have some luck looking for a carburetor under a Yamaha part number.
Circa 1983 two cylinder Yamaha.
https://www.ebay.com/itm/196268922839?_skw=Yamaha+25hp+2+Stroke+Carburetor+6h7-14301-72-00&itmmeta=01JBMZJ4HDMCKNKVBVK0SDFJ2N&hash=item2db28a17d7:g:EOgAAOSwrM9l31ev