The Riva Power Filter feeds your Yamaha HO engine a steady diet of cool air delivering greatly improved acceleration and rpm. Replaces restrictive stock air box with a screen-type, stainless steel filter element that is certified to meet U.S. Coast Guard 'SAE J1928' requirements and attaches to the throttle body via a precision machined velocity stack. Also features an easy to install Engine Breather Upgrade Kit that eliminates power-robbing crankcase emissions from your engine's air intake. Kit includes water-repellent pre-filter and detailed installation instructions.
