The pilot screw is on the underside of the carbs, just outside the float bowl. It's purpose is to measure the fuel/air mixture for the idle/slow jet. Turning it in leans the mixture, turning it out richens the mixture, and taking it out entirely does.....well I don't know but I'm sure it would cause the bike to run poorly. Aside from the screw itself there should also be a spring,washer, and rubber o-ring.
Did ya get the carb specs I sent?