Hi Ragz,I am not the best at explaining things like this. I will try to explain better. Your engine has a hole in the crankcase under the carb. and thur the carb. insulator block. This pulse from the crankcase pressure thur the insulator block works the carb. pump in the carb. If it is partly blocked or misalined with the gaskets, then the carb. cant pump enough fuel to keep the engine running. I hope this makes sense to you. Maybe someone that can explain it better will jump in and help. It might be something else, but I would take a look at how the carb. is mounted. Check to see if you have an airleak around carb. Hope this helps, Wayne M.