Thanks for the replies.
I'll try some thorough cleaning of the dashpot and piston again and refill with oil.
That may well sort out the occasionally sticky piston. If not, would it be worth re-centring the needle?
As far as the slightly raised piston is concerned, I now wonder whether the choke cable needs adjusting on the rear carb. If the choke cable position means that the fast idle is still slightly 'in play' would that not have the effect of the piston raised higher and thus sitting differently from the other carb?
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