The spring is on the top of the carb. There are 4 screws holding the cover (brass colored, when it new) on. Be careful those screws are soft and they will strip easily.
As far where the screw goes? Not sure what screw your talking about. The jets are threaded. The air/fuel screw is on the bottom side of the carb. Screw it all the way in, then back it out 2.5 turns per the Dynojet instructions, to start.
As far where the screw goes? Not sure what screw your talking about. The jets are threaded. The air/fuel screw is on the bottom side of the carb. Screw it all the way in, then back it out 2.5 turns per the Dynojet instructions, to start.