Adhesive oil should be applied after complete cleaning of the intake silencer. Once drying is complete, an additional touch of prevention can be given, applying a specific oil to the sponge that creates a further protective "surface" so as to prevent impurities from penetrating the filter element. This solution was invented for motocross, where the filters are exposed to a greater quantity of earth, sand and dust, but it is also adopted on the track. Although there are specific products such as, for example, the special FreeLine liquid (read"Must Have | 8 products for cleaning the intake silencer for karts" to find out which are the main tools to use in managing filters, editor's note), in karting the same practice is less widespread, because it generates a slight negative impact on engine performance. In fact, the oil makes carburation rich (decreasing the air supply and consequently increasing the petrol flow) and slightly "throttles" the engine. The sponge retains its filtering capacity even if no oil is applied to it, but the adhesive oil expands the potential of the filter element because it allows it to hold more dust and generally more impurities. Therefore it is recommended on circuits often hit by gusts of wind that bring dust and sand onto the track. On the other hand, adhesive oil is not to be used with cartridge filters: it is only suitable for those with a sponge filter.
Assessing the effectiveness of cleaning is simple because the answer is visible when the silencer is dismanteled to service it (follow the instructions given in
"Doctor TKART - Servicing intake silencers" to do it properly, editor's note) or for any check on the engine. In fact, the inlet to the carburettor mouth, properly known as the venturi duct, is only clean if the intake silencer has been cleaned correctly. If, on the other hand, dirt residues remain in the filter, they will tend to be sucked in by the engine and therefore "stain" the carburetor inlet port. A dirty venturi will have a series of deposits, which can be caused by rubber fragments or other impurities. It should be noted that to understand if a silencer has been cleaned well it is essential to reassemble all its components in the same position and pay particular attention to the filter element, whether it is a sponge or cartridge type.
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