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Perhaps the flange is warped? You can test that by smearing grease all around the edges of the join to the cylinder. If the bike runs reasonably well for a short time (until the grease melts) then you know you have a warped flange and air is leaking into the cylinder. You can dress it flat using a piece of plate glass and rubbing compound, and lots of patience.
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A 276AW/1BB is off a BSA B31 1946 to 1948 and may have the bowl on a 3 degree or 7 degree angle or has it got the proper M20 bowl of 1B which is no angle. If you have a 7 degree angle bowl you may find it will play up on bendy roads as too rich on some bends and too lean on other bends but should not upset the starting. If the bike is starting and then stopping real quick has it got stale fuel?
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And have you pulled the choke lever to off? Sounds silly but I have met a few guys who think the choke is off by pushing it away:thinking_face:
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This might sound a bit daft but it's happened to mne when restoring older bikes.
A rat or mouse family makes a home in the silencer and they bring in enough bedding material to block the pipe. Successive generations bring in more material. The bike will start eventually but will not rev above idle. Worth checking...
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The carb has the 1b float bowl
It is possible a bit more rubbish has entered the carb from the tank , so i will strip it again