Complete genuine SU master overhaul kit for single HS4 carburetors with plain discs and plain jets. This kit is for carburetors with earlier non-waxstat jets and plain throttle discs without an overrun valve. This kit includes everything you will typically need to overhaul the carburetor. Includes jet assembly, needle and seat, throttleshaft, disc, fasteners, throttleshaft bushes, and all gaskets and seals.
 
Does not include float, needle, or jet bearing assembly.