Nope, those are air jets. The pilot is inside the fuel bowl. As carb sits on the bike the higher smaller OD long brass jet between the float sections. NOT the main jet which sits lower in the fuel.
Can be the accelerator pump discharge hole on that one carb affected too. The others working but one not. With fuel in the bowls you work the throttle and the same fuel stream must squirt out of all 4 of the holes into the carb bores with the choke open. The discharge port is likely that stub that sticks up that the choke plate almost hits at fully closed. It has a hole facing forward that you can't see looking into back of carb.
The pilot appears to be a #35, they can be carefully opened up like the #38 or #40 these engines commonly use, with a piece of guitar 'E' string wire, the smallest wire one uses. The wire is about the size of that hole or around .013". You're putting steel wire into a softer brass jet, go about it in a haphazard way and you can scrap the jet but be careful and it's fine.