Block was away for 16 weeks being rebored. But it’s all back together and not smoking nearly as bad ( a little puff now and then). After a all the work (both engine and gearbox was overhauled) teething problems are like starting over. Took it to work one day (17 miles), normally a 20 minute drive. It played up a little on the way. I put it down to carburettor icing. How wrong was I? It was a 5-1/2Hr journey home. What fealt like carburettor problems turned out to be the coil shorting internally. Found the carb floats were damaged and the threads for the needle valves were shot. Mr Prew helped me with a new pair. Runs great now!