Many people have issues with the service provided by the service centres and often complain about how the engine has been “messed up” after the service. More often than not an improper Carburettor tuning will be the main cause of a “messed up “engine. With a help of just a screw driver the process can be done. Before you to understand how to set the air-fuel mixture and tune a carburettor, first we need to know what the function of a carburettor is. A carburettor is device that regulates the flow of the fuel to the engine, atomises the fuel and is used to change the air fuel-ratio.