Good point! I assume too often.

The kits are usually pretty generic save for a couple of casting numbers. Numbers and locations are here.

AFAIK only Retrobikes and Sirius have the kits with both jet needle and needle jet (nozzle). But, there have been quite a few guys that rebuilt their carbs with the kits from PartsNMore.

The ONLY SOHC CB750 Chopper site on the net bar none. All others are just imitations.