Uckillya,
Ok it sounds like the fuel is running straight into the cylinder.
1. Do you have fuel leaking from the carby?
3. If wet turn fuel tap off and pull the motor over about 20 times to release the fuel from the cylinder.
4. The dry the plug and put it back in and try to start with the fuel tap turned off and the throttle in the hot start position.
Try that and see if it will start before turning the tap back on.