Thanks for that Tris, indeed they are supposed to be copies, but not very good ones in my experience! Having started this thread I did receive a carb from Terry and in his defence and indeed to his credit he sent me carb FOC. However it turned out to not be a new one! I fitted it and it promptly leaked fuel from the fuel tap and when I took it apart there was salt corrosion around the rubber sealing mechanism. I sorted that but the motor still ran like sack of s**t - exactly as it did with the old carb! I could get it to run quite well but as soon as then engine angle changed it would play up. By that I mean if I turned (as in steered) Or altered the trim angle it would play up as if the float level in the carb was wrong. I tried all sorts but in the end gave up.
I hate to admit defeat but this one got me!!