Patent ID: 6887117

Claim:
A marine outboard motor comprising: a power unit comprising a drive output and an exhaust outlet; and a pump jet comprising a rotor hub and a rotor carried thereby, said rotor hub connected to the drive output of said power unit for selective rotation for forward or reverse motion, said rotor hub having an internal passageway connected in fluid communication with the exhaust outlet, and an exhaust bypass movable between normal and bypassed positions, said exhaust bypass comprising an outer sleeve having a plurality of spaced apart exhaust windows therethrough, and an inner sleeve having a plurality of spaced apart exhaust windows therethrough, said exhaust bypass being in the normal position when the spaced apart exhaust windows are non-overlapping for directing exhaust through the internal passageway of said rotor hub to discharge downstream of said rotor during forward motion, and being in the bypassed position when the exhaust windows are overlapping for bypassing exhaust from the internal passageway to discharge downstream of said rotor during reverse motion.