HV5 Piston & Suction Chamber Assembly — 0.125" Shank Needles | ABF686

Genuine SU HV5 piston and suction chamber assembly. The suction chamber and piston are the core of the SU carburettor's variable-choke mechanism. The piston rises and falls in response to engine demand, metering fuel via the attached needle. Replace if the piston is scratched, scored, or if there is excessive side play in the assembly.

Part Number: ABF686