In specialist off -road motorcycles, polyurethane sponge air filters are used to facilitate cleaning. This material is rich in open alveoli where the air is forced to pass. To filter without letting the dust enter under the action of the air flow must be soaked with a specific oil. The quality of the lubricant is very important as it must be able to retain smaller impurities without limiting the influx of vital air for the right carburation of the engine. So we advise you to always use specific products like this. Please check with the customs of your country to determine what these additional costs will be before making offers or buying items. From 29 August 2025, due to a decision by the United States government, all shipments to the USA are subject to customs clearance and payment of d.
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