Dry foam will not stop dirt! A dry area as little as the size of a coin will allow dirt a virtually unrestricted path to the engine. It is therefore imperative the foam is completely oiled.
The best way to ensure the filter is properly oiled is to completely submerse the foam in filter oil and squeeze out any excess. (With its tough urethane sealing gaskets the FunnelWeb Filter can be wrung out gently without stretching the seal out of shape.)
Pour a bottle of filter oil into a good quality 4 or 5 liter container with an air tight lid.
Immerse the filter completely and squeeze any excess oil back into the container. Refit the lid and the oil is ready for the next filter service. (A 1ltr container of oil should be enough to oil approximately 10 motorcycle filters.)
Allow filter to stand for 15 minutes and then massage foam to evenly spread oil throughout.
Refit to filter supporting frame and allow to air, enabling all thinning agents in the filter oil to disperse.(Refer to oil manufacturer's instructions.)
Carefully wipe any dirt from inside of the air box where the filter seals.
Apply a layer of grease to the filter seal and refit to air box.
Any foam filter requires regular visual inspections to look for "dry" areas of foam or excessive dirt build-up on the filter.
Dry areas appearing on the surface of the filter is a fair indication it is due for servicing.
Dirt build-up can also restrict air flow resulting in a performance drop.
The FunnelWeb Filter is manufactured using pyramid profile foam which doubles the surface area of the filter. This allows more dirt to be trapped before drying out or loading up.
An indication the FunnelWeb Filter requires cleaning is the drying out of the peaks of the small pyramids all over its surface.