The K&N HA-7504 is a direct-replacement, oval-tapered engine air filter for select Honda VT750 Shadow motorcycles, sold as a single pre-oiled element. The pleated media uses multiple layers of woven cotton gauze, and the manufacturer specifies an application-specific base seal and sealing bead for this fit. It is made in the USA and is designed to drop into the stock airbox without intake modifications.
Unlike a disposable paper element, this K&N filter is washable and reusable, so you clean and re-oil it instead of buying a new one at every service interval. The manufacturer describes it as designed to increase horsepower and torque while keeping restriction low. Owners on user forums point to skipping recurring replacement costs as the main reason to switch, and one owner reported cleaning his at roughly 48,000 miles with the bike still running well.
Before ordering, confirm your bike's model year and submodel. K&N's own pages list different year ranges for the Shadow Aero, Spirit, Phantom, and RS variants, so use the manufacturer's application lookup to verify fitment for your VT750C, VT750C2, VT750C2B, or VT750 RS. Installation is a quick job, and the manufacturer rates it an easy DIY task that needs only a screwdriver. Keeping the filter clean and properly oiled is what preserves its filtration and airflow, so follow K&N's cleaning procedure at each service.
The manufacturer lists the filter for the VT750C Shadow Aero, VT750C2 Shadow Spirit, VT750C2B Shadow Phantom, and VT750 RS Shadow RS. Year coverage differs between K&N's own listings, so confirm your year and submodel with the manufacturer's application lookup before buying.
The manufacturer's procedure is to tap off loose dirt, spray K&N cleaner on both sides, let it soak about 10 minutes, rinse, shake off excess water, and let it air dry naturally. Re-oil only once it is dry or slightly damp, then work the oil in until the filter shows an even red color with no light spots.
Owners on user forums report that a washed K&N takes a while to dry fully, and that the wait is the most tedious part of servicing it. Plan for a drying window before applying oil, and keep a spare filter on hand if you ride during the drying period.
The manufacturer rates this filter an easy DIY job, lists a screwdriver as the typical tool, and gives an installation time of 5 to 10 minutes. Remove the airbox cover, take out the old element, and note how it sits. Seat the new filter so the base seal and sealing bead sit flush against the airbox all the way around, since any gap lets unfiltered air bypass the cotton. Before riding, check that the cover and fasteners are secure. Clean the airbox of debris while it is open so dirt does not enter the intake.
