Abstract: A backrest structure for a motorcycle that is structured to be simply movable, yet made inoperative at all times except when an occupant intends to move the backrest. A backrest is disposed on a seat rail and includes operation levers for raising and lowering the backrest. The operation levers are disposed in the seat rail disposed downwardly of an occupant's seat.

Abstract: A backrest structure for a motorcycle that is structured to be simply movable, yet made inoperative at all times except when an occupant intends to move the backrest. A backrest is disposed on a seat rail and includes operation levers for raising and lowering the backrest. The operation levers are disposed in the seat rail disposed downwardly of an occupant's seat.

Abstract: A body frame for a motorcycle for ensuring the binding rigidity between an engine and a body frame while reducing the weight of the body frame, and also increasing the flexibility of the disposition of motorcycle components. A body frame includes a first frame member and a second frame member, the first frame member and the second frame member being separated relative to each other. At least one engine support is formed integrally with the first frame member. Another engine support and a pivot portion for a rear swing arm is integrally formed with the second frame member. The first frame member gradually expands towards the at least one engine support with three approximately M-shaped projections being formed at an end of the first frame member wherein the at least one engine support is formed at these projections.

Abstract: A body frame for a motorcycle for ensuring the binding rigidity between an engine and a body frame while reducing the weight of the body frame, and also increasing the flexibility of the disposition of motorcycle components. A body frame includes a first frame member and a second frame member, the first frame member and the second frame member being separated relative to each other. At least one engine support is formed integrally with the first frame member. Another engine support and a pivot portion for a rear swing arm is integrally formed with the second frame member. The first frame member gradually expands towards the at least one engine support with three approximately M-shaped projections being formed at an end of the first frame member wherein the at least one engine support is formed at these projections.

Abstract: An air cleaner housing includes an upper case, a partition wall and a lower case. The inside thereof is partitioned into an upper, filtered side and a lower unfiltered side. Intake funnel pipes, connected to front and rear cylinders, project into the filtered side. An air cleaner element is provided on the front side relative to a hollow plenum above the intake funnel pipes. Inlets in side surfaces of the unfiltered side face toward a V bank of the engine. During use, air enters the bottom of the housing, and is cleaned by the air cleaner element. The clean air flows through the filtered side of the housing, into the intake funnel pipes and toward the cylinders on the lower side. A raised portion is formed on the front upper side of the upper case, and the air cleaner element is disposed inside the raised portion.

Abstract: An intake system for a vehicle engine includes an air cleaner and a plurality of throttle bodies. The air cleaner encases an air cleaner element in an air cleaner housing for filtering air flowing from an unfiltered air chamber to a filtered air chamber of the air cleaner housing. The throttle bodies control the amount of air supplied from the filtered air chamber to a cylinder head. Operating noise of the throttle bodies is minimized by situating the throttle bodies within the air cleaner housing. Operating noise of fuel injectors associated with the throttle bodies is minimized by situating the fuel injectors within the air cleaner housing.

Abstract: An air cleaner housing includes an upper case, a partition wall and a lower case. The inside thereof is partitioned into an upper, filtered side and a lower unfiltered side. Intake funnel pipes, connected to front and rear cylinders, project into the filtered side. An air cleaner element is provided on the front side relative to a hollow plenum above the intake funnel pipes. Inlets in side surfaces of the unfiltered side face toward a V bank of the engine. During use, air enters the bottom of the housing, and is cleaned by the air cleaner element. The clean air flows through the filtered side of the housing, into the intake funnel pipes and toward the cylinders on the lower side. A raised portion is formed on the front upper side of the upper case, and the air cleaner element is disposed inside the raised portion.

Abstract: An intake system for a vehicle engine includes an air cleaner and a plurality of throttle bodies. The air cleaner encases an air cleaner element in an air cleaner housing for filtering air flowing from an unfiltered air chamber to a filtered air chamber of the air cleaner housing. The throttle bodies control the amount of air supplied from the filtered air chamber to a cylinder head. Operating noise of the throttle bodies is minimized by situating the throttle bodies within the air cleaner housing. Operating noise of fuel injectors associated with the throttle bodies is minimized by situating the fuel injectors within the air cleaner housing.

Abstract: A predetermined volume for a fuel tank and to make the fuel tank slim and further to provide a more suitable knee-grip. The rear end portion of the fuel tank is formed into an extension extending rearwardly behind the rear end portion of the main frame and is arranged under a seat and between left and right seat rails. The fuel tank is expanded under the seat. Accordingly, even if a predetermined volume is ensured for the fuel tank, the front portion of the fuel tank in front of the seat can be reduced in width, height, and length to make the fuel tank slim as a whole and, in particular, to make a knee-grip narrower to provide a most suitable riding position.

Abstract: A support structure for a motorcycle's rearview mirror includes a vibration dampening device. The support structure includes a mirror base attached to a fairing stay of the motorcycle. The vibration dampening device includes an isolated weight supported between two elastic members. The elastic members are attached to the fairing stay close to the attachment location of the mirror base to the fairing stay. Since the isolated weight is attached to the fairing stay, it can be large enough to sufficiently dampen vibrations which propagate along the fairing stay, without adversely affecting the outward appearance of the motorcycle.

Abstract: A support structure for a motorcycle's rearview mirror is constructed so as to dampen any vibrations which would normally be transmitted to the rearview mirror, and to reduce the risk of rattling noises in the rearview mirror assembly. The support structure includes a mirror stay, in the form of an elongated tubular extension, which serves to distance the rearview mirror from the motorcycle. One end of the mirror stay is connected to the motorcycle through a mirror stay supporting structure, which allows the mirror stay to rotate within a limited range. A rearview mirror housing is connected to the other end of the mirror stay. The connection between the mirror stay and the rearview mirror housing is accomplished by a rearview mirror main body supporting structure. The rearview mirror main body supporting structure allows the mirror housing to assume various orientations relative to the mirror stay.