The K&N KN-401 is a cartridge-style oil filter measuring 3 in OD by 0.75 in ID, sized for motorcycles and ATVs from Honda, Kawasaki, Yamaha and Triumph. The manufacturer's stated design pairs high-efficiency synthetic media with uniform pleats, so the filter aims to trap contaminants without restricting oil throughput. It is laboratory tested for capacity and burst strength, and the manufacturer says it works with synthetic, conventional and blended oils, which makes it a practical upgrade for riders running full-synthetic or racing oils. The one-year limited warranty adds further assurance over a generic cartridge filter.
Fitment is the key check before ordering. The manufacturer lists Kawasaki (16099003) and Yamaha (36Y134410000) cross-reference numbers, so match your original OEM part number to confirm the application for your model year. Installation is a short job, and the manufacturer lists roughly 20 to 30 minutes. The manufacturer's spec sheet shows no removal nut on this filter, so plan on a filter wrench or the correct tool for removal. Check the two O-rings for correct seating before installing the new filter.
No. The manufacturer's specifications list no anti-drain back valve and no bypass valve, and no PSI relief valve. Compare the design against your original filter before swapping.
No. The manufacturer classifies it as a cartridge style, so it installs inside a housing and is sealed with O-rings rather than threading onto the engine.
The manufacturer states the filter is engineered for up to 20,000 miles of protection. Your oil-change interval should still follow the vehicle maker's maintenance schedule.
Per the manufacturer, installation takes about 20 to 30 minutes. Because the KN-401 has no removal nut, keep a filter wrench or the correct socket on hand. Drain the oil first, confirm the cartridge and both O-rings sit correctly in the housing, and follow your service manual's torque specification, since the manufacturer's listing does not provide an install torque value.
