Abstract: A spin-on oil filter can be mounted in an easily accessible position on an engine by means of an oil filter housing comprising a lower housing unit, which comprises an open-topped chamber, and an upper housing unit. A male threaded portion, adapted to mount a spin-on oil filter, extends up from the bottom surface of the lower housing unit. A flat gasket sealing surface is located on the bottom surface, wherein the gasket surface is perpendicular with the male threaded portion. The housing comprises three passages: (i) a first passage adapted to permit flow of dirty oil to an oil filter mounted on the male threaded portion; (ii) a second passage adapted to permit flow of filtered oil away from an oil filter mounted on the male threaded portion; and, (iii) a third passage adapted to permit drainage of oil from the open-topped chamber. The upper housing unit is removably attached to the lower housing unit, and is adapted to cover the open-topped chamber.

Abstract: In at least some embodiments, the present invention relates to an air cleaner having a housing portion, and a low profile rain cover having an opening on an underside of the cover to allow unfiltered air to enter into the air cleaner. Also, in at least some embodiments, the present invention relates to an air cleaner including a housing and an additional component by which the air cleaner is capable of being directly coupled to a carburetor inlet. In some such embodiments, one or more protrusions can be provided within a channel formed by the housing/additional component to influence air flow. Further, in at least some embodiments, the present invention relates to an air cleaner having a shaped wall formed on a housing portion, where the shaped wall includes both an interior surface and an exterior surface by which air flowing within the air cleaner is imparted with helical motion.