BS 34's , Hinged seat, Mag wheels and the carbs have their fuel line plumbed to the outside of the carb. Euro 80G???? Vin no would confirm.
Pilot screw should look like this. Yours looks like it is from a set of BS38 carbs. Be real careful, if it has been jammed in to tight it could break the tip off in the carb body
Scroll down to pot #8 for BS34's. Pilot screw on the 34's has a spring, washer and rubber ring it seats on. Pic of the pilot screw with spring, washer and ring in post #8
https://www.xs650.com/threads/tentative-carb-id-layout.43392/