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Have you checked the points on the dizzy? Listening to the video I'd say something isn't right with the carb and the fuel supply. From memory the carb has a bi metalic choke (small sort of round black casing connecting to the cold start. On the drivers side of the carb under the air filter housing there are two black rubber pipes joined to two plastic pipes check these for security and deterioration. It may be worth checking the plugs for tightness, it's not unusual for alloy heads, when they get a little old and have had a few hundred plugs, for the threads to get a little tired; on cold the threads may seem ok nice and tight, as the engine warms these start to expand allowing the plug to move a few thousandth causing the engine to not start when hot. Although I'd agree with the majority and say it's carb related have you taken the carb of the manifold and check the gasket for security not sure if it's a large vulcanised rubber one or a single paper one.

Charlotte