Carburettor Intake Socket Carburettor intakes are wearing parts because they are made of rubber. After a number of years, the rubber starts to crack. If secondary air is sucked in through these cracks, it will affect engine combustion. The consequences range from loss of performance and starting problems through to serious engine damage. It is therefore important to replace cracked carburettor intakes. At Louis you can buy carburettor intakes for many scooter models at a modest price and so avoid a costly engine repairs.