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Thanks for the advice. I have been playing around with things again today. I had some smaller idle jets, 45 as opposed to the 50 ones fitted, so they have gone in. (Incidentally the main jets are 115.) In working on the carbs I noticed that one of the carb to head rubber manifolds was in a poor stat...

My 3 1/2 sport always stalls whenever I come to a stop and the revs run down towards tick-over. It will then always immediately restart on the electric start ( that has been retro-fitted by a previous owner) and tick over. Other than this it seems to run perfectly. I was thinking it was either fuel ...