K&N Replacement Air Filter Yamaha Tdm850 1992-2001 Designed to perform, these air filters will increase airflow over stock filters. Features: K&N filters can increase horsepower by up to 12 Clamp-on style is designed for all racing motorcycles Allows considerably more air flow than stock air box set-up Straight, oval-shaped air filter with centered flange Cotton gauze filter material Filter can be re-oiled with 0.28oz (8 mL) filter oil (sold separately) Base Outside Length: 4.5 (114mm) Base Outside Width: 3.75 (95mm) Flange Inside Diameter 2.438 (62mm) Flange Length: 0.625 (16mm) Filter Height: 2.75 (70mm) Note: Carburetor adjustment will be required usually a 25 increase in jet sizes can be expected.