There is not a great deal to go wrong with the cable itself. There is no adjustment at the pedal end, just make sure the cable conduit behind the rear wheel has the correct 'sag'. and that both ends of the conduit are solid in their mounts. If the cable is all good then it looks like the engine will have to come out to see whats going on inside the bell housing.
The cable might need a little nipping up after a new one is fitted, but not to the extent you describe.
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