Starting your moped. You do this with your kickstart, you crank your moped or you might even have an electric start. Either way, if your moped has an internal combustion engine, it needs flammable fluid to start. This fluid, in this case petrol with probably some oil, goes through your petrol tap towards your carburettor. This is drawn in by compression at the carburettor. At that moment, the carburettor probably has its throttle slide closed but through the idle nozzle and/or other channels such as air supply or the choke, the petrol rises at rapid speed.
The right mixture ratio, adjusted by idle nozzle in your carburettor together with your air filter will take care of the start. The follow-through or main nozzle in your carburettor will take care of the throttle response. Thanks to the float and float needle in your float bowl hanging at the bottom of your carburettor, your carburettor will not overflow.
If your carburettor overflows, you can solve this by adjusting the position of the float needle. How to know all this? Check out this video where we explain from A to Z what a standard carburettor has!