Dave,thanks for your reply. Tried turning the needle in to 1.5 turns. The engine started with priming but died again (as soon as the primed fuel in the carby runs out).

I took all the pipes one by one of the engine and blew through them. The front nipple on the engine where the instructions say to connect the fuel clunk too was impossible to blow air into. This leads me to suspect that something is blocked as you indicated could be the problem. I then tried to suck from the rear nipple which is supposed to blow back into the fuel tank. That was no good either.

What would be my next step?

Grateful for your help

Dave.