The MGB uses separate cables to operate the throttle and choke, each running from the cockpit through the bulkhead to the carburettor linkage in the engine bay. Both cables changed across production, and the correct replacement depends on the car’s model period and gearbox type.
Choke Cable
The choke cable runs from a pull knob on the dashboard to the carburettor choke linkage. The knob style changed three times during production, a round knob with a ‘C’ motif was used on chrome bumper cars from 1962 to 1969, a round knob with a fan motif was used from 1970 through to September 1976, and a T-shaped knob was introduced from September 1976 to the end of production. The cable length and routing differ between the fan motif chrome bumper and rubber bumper versions, so both the knob type and the car’s bumper type must be confirmed when ordering. The bulkhead grommet through which the choke cable passes also differs between chrome bumper and rubber bumper cars.
A sticking or seized choke cable is one of the most common complaints on MGBs that have not been regularly maintained. The inner cable corrodes within the outer sheath over time, particularly where moisture enters at the bulkhead grommet or at the engine bay end. A cable that does not return fully when pushed in will hold the choke partially on, causing rich running, high fuel consumption, and sooty spark plugs. Replacing the cable and renewing the bulkhead grommet at the same time is the most effective cure.
Accelerator Cable
The accelerator cable connects the throttle pedal to the carburettor throttle linkage and differs between chrome bumper manual, chrome bumper automatic, and rubber bumper applications. Chrome bumper cars with the 3-synchro gearbox used a different cable routing with a guide tube and seal from later 4-synchro cars. The cable guide, its seal, and the securing clips are available individually for situations where the cable itself is serviceable but the mounting hardware has deteriorated.
When replacing either cable, it is worth inspecting the condition of the pedal pivots, return springs, and linkage components at the carburettor end. A new cable fitted to a worn linkage will still feel imprecise, and worn return springs can prevent the throttle from closing fully, a safety concern that should always be addressed. The MGOC Spares range covers accelerator cables, choke cables, bulkhead grommets, cable guides, seals, and clips for every MGB configuration across the full production run.