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Trouble is Joachim's reply means taking the tank off

Which is what you gotta do to swop the pipes around to make your bike run.....

Unless there's another way to get at the pipes?

Actually just tried that, managed to get fingers up behind body and swapped pipes over, no difference, ho hum, here we go again !

Odd behaviour, even if the fuel lines are connected wrongly. I wonder if the tap filter is blocked? If that is OK I fear it may be grot in a jet or passage in the carb.

The more I think about it, the more I think it is something like a major blockage in the inlet, or perhaps the two carbs not working together. Haven't looked at them closely to see how they operate, they are the two Dell ortos as it's a 350.

Not the air filter, carbs now off, and will check supply from tank, but I'm not inclined to think it's that simple. I'll report back soon.