Patent ID: 6189637
Filing Date: 2001-02-20
Classification: F01L,F02B,F02F

Abstract:
A motorcycle including a horizontally-opposed engine, said engine comprising:a pair of left and right cylinder heads connected to a pair of left and right cylinder blocks wherein combustion chambers are formed between each of said cylinder blocks containing a plurality of cylinder bores disposed in parallel with axial lines thereof extending substantially in a horizontal direction;pistons being slidably fitted in said cylinder bores;a crank shaft being disposed substantially perpendicular to the axial lines of said cylinder bores; andsaid engine being mounted on said motorcycle with the axial line of said crank shaft extending in a longitudinal direction, said engine including a plurality of exhaust passages for introducing exhaust gas from said combustion chambers, said plurality of exhaust passages being provided in each of said cylinder heads in such a manner as to be tilted toward the central side of said motorcycle in the width direction and to be opened downwardly; andexhaust valves for selectively connecting and disconnecting said exhaust passages to or from said combustion chambers corresponding to said exhaust passages are disposed in each of said cylinder heads over a plane passing through the axial lines of said cylinder bores.