How to Clean and Oil a Twin Air Foam Air Filter

Step-by-step instructions

Step 1: Identify the filter and protect the engine intake

Work with the engine off and cool, then remove the filter following the vehicle's procedure. Note the cage, sealing surface, and fastening arrangement before separating anything. Keep loose dirt out of the open intake and use the prescribed intake protection during airbox cleaning; remove any temporary protection before reassembly. Twin Air's application information helps distinguish the correct filter arrangement. Do not assume a foam prefilter replaces the paper element beneath it or that another motorcycle's cage fits your airbox.

Step 2: Match the cleaner to the oil already in the foam

Choose the correct Original or BIO maintenance system and read both product labels. If you do not know which oil was used, obtain compatibility advice rather than guessing from its color. Set up a ventilated work area away from ignition sources where required by the products, and keep cleaning tubs separate from household dishes. Wear the specified protection. This preparation matters because an incompatible cleaner or an improvised solvent can damage the foam or leave contamination that the next oiling step merely conceals.

Step 3: Soak and squeeze using the selected system

Twin Air's care instructions specify a 3–5 minute soak in Original Dirt Remover or a 12-hour soak for BIO Dirt Remover. Follow the current product label if its directions are more specific. Gently squeeze the foam to release trapped dirt without twisting it. Inspect seams while handling the filter and stop if the foam tears or separates. Do not use gasoline, which Twin Air warns can harm glued seams, and do not scrape a stubborn patch with a stiff brush.

Step 4: Rinse appropriately and dry before oiling

For the Original route, the manufacturer describes warm soapy washing followed by a clean-water rinse; the BIO route uses warm tap water after its cleaner soak. Keep working until the approved process has removed the dirt and cleaning residue. Squeeze out water gently and leave the filter to dry thoroughly in a suitable open area. Avoid compressed air and hair dryers. A filter that feels dry outside may retain moisture inside thicker foam, so check it carefully before moving to the oiling tub.

Step 5: Apply foam-filter oil evenly through the element

Use oil specifically formulated for foam air filters, not gear oil or a product selected only because it is oily. Saturate the clean dry foam using the matching Twin Air oiling instructions, then massage and gently squeeze out excess until the coating is even. Twin Air's filter-care system describes a dedicated oiling tub for this process. Look for untreated areas rather than judging only the outer color. Do not wring the filter into a rope or leave a pool of excess oil inside it.

Step 6: Allow curing time before installing for a ride

Plan this job ahead of riding. Twin Air's support page describes open-air drying after oiling and separately recommends pre-oiling at least 24 hours before riding so the oil distributes and its thinning agent can evaporate. Use that advance-planning guidance and the oil label rather than treating a shorter stage time as immediate permission to start the engine. Keep the curing filter clean and protected from airborne workshop debris without sealing it in a way that prevents the required evaporation.

Step 7: Reinstall correctly and check the seal

Inspect the dry airbox, cage, and mating surface according to the vehicle's instructions. Fit the fully prepared filter without folds, gaps, or trapped debris, using the specified sealing treatment only where required. Secure the original fastener and verify seating around the entire rim. Remove any temporary intake cover before closing up. If the foam is torn, seams are failing, or dirt is visible downstream, stop and investigate rather than relying on more oil. Record the service and inspect according to riding conditions, especially after dusty use.