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Well?

How did he get on?????

That doesn't make things easy.

What carb is it?
Is the jetting right?

Where in Melksham are you?

A 50 is never going to be quick, It's all relative, really

Have you actually removed the carb from the bike?

Is the exhaust or air filter blocked?

Has the bike had any other work or...

when it cuts out is there fuel in the carb at that time?
Don't check it a few minutes later, loosen the screw in the float bowl straight away.

Or

Try opening the filler cap and road testing it...