Well I got it running well after i pulled out the mixture needles again and re set them. But after it runs for a while it stops again as before cry I can actualy see the problem now, the fuel tank seems to be pressurising and flooding the carby via the primer line. Fuel flowing into the carby throat and flooding it once it has stopped running. The tank has a breather on it but it is a rubber one way valve only designed to let air in not out. could this be a problem with the metering needle adjustment? I did replace the needle and diaphram and set the lever correctly.

Paul