There are two types of air cleaners fitted to carburettor engines, one is a disposable element type and the other is a sealed throw-away type. The processes of removal, dismantling, reassembly and refitting are simple. Maintaining the air cleaner element is extremely important to engine efficiency, especially in dusty operating conditions, which require them to be checked more often. In addition, the full filter or its element should be replaced at 24,000 miles (40,000 km).