The carburettor has the important job of ensuring the right amount of air and fuel mix is provided to the cylinders in the engine in order for combustion to take place and for the engine to perform at its best. 

The carburettor is essentially a pipe through which the air needed for combustion travels. The carb narrows in the middle which causes the pressure in the air as it flows through the carb to drop at this point, creating a vacuum which sucks the fuel in. It works by using valves, referred to as the choke and throttle, which take in the right amount of air and fuel which is mixed in the carburettor before it is sent to the engine. 

The carburettor is mounted on carb mountings which are designed to act as a sealant, holding the carburettor firmly in position and perfectly aligned. The carb mountings are usually a flange/plate used with circular rubber seals to create a soft, secure fix between the carburettor and the mount.  The carb mountings function to strengthen the holding of the carburettor to the intake manifold and to keep it in the right position, as well as absorbing vibrations and noise from the engine.  

Signs that the carburettor may need replacing can include difficulty starting the vehicle when the engine is cold; an engine that persistently overheats; stuttering when accelerating; and a backfiring exhaust. When you encounter an engine problem, it is a good idea to consult with your mechanic to establish the exact root of the problem before purchasing new parts. Carb mountings will wear over time and can become brittle and cracked. Warped carb mountings can lead to a vacuum leak. The carburettor can become clogged up inside which can restrict the air and fuel intake and cause this part to malfunction. Replacing this vital part when it has failed with the carburettor will ensure perfect compatibility, specifically designed for the make and model of your vehicle.