Thanks for all the advice. So far I have replaced the carb inlet rubbers, changed the spark plug and checked the compression (110 which was low as expected) as well as the usual obvious stuff (idle screws etc) and had the carb serviced. Still no joy. I'm loathed to get a re-bore done which will cost a load when no-one (including motobike mechanics) can tell me what the problem may be. I'll try some more of the suggestions above in the mean time and any further advice is much appreciated.
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