In a saddle-ride type vehicle in which an air cleaner is arranged inward in a vehicle width direction of at least a pair of left and right main frames and arranged below a riding seat, a cleaner case for the air cleaner is configured long in a longitudinal direction of the vehicle and has a cleaner case main portion storing therein a cleaner element, and a connecting tube connection portion extending forward from the cleaner case main portion so as to be connected to a connecting tube. A pair of left and right side covers covering the cleaner case from opposite sides in the vehicle width direction are supported by side cover supporting portions that are provided on left and right opposite side walls of the cleaner case main portion and the connecting tube connection portion.

A saddle-ridden vehicle includes: a pair of frame members which are disposed on one side and on other side in a vehicle width direction so as to extend in a vehicle front-rear direction; an engine which is disposed between and supported by the pair of frame members; an air cleaner which cleans air for fuel combustion; a supercharger which compresses the air cleaned by the air cleaner; an intercooler which cools, using a cooling wind, the air compressed by the supercharger and supplies resulting air to the engine; and an exhaust wind duct which determines a discharge position or a discharge direction of the cooling wind discharged from the intercooler, and the exhaust wind duct is disposed above the engine on the one side in the vehicle width direction and extends to rear of the engine.

A motorcycle (1) is proposed in which a grip opening (29) forms a part of the flow path of the intake air of the engine (2). This grip opening (29) is formed by gaps (5) in the side spoilers (3, 19) and a recess (8) in the rear frame (6). Arranged at the recess (8) are the air inlet openings (11, 12, 13, 31, 32) of the air guidance device (9) in which the air filter element (7) for cleaning the intake air of the engine (2) is located.

A motorcycle (1) is proposed in which a grip opening (29) forms a part of the flow path of the intake air of the engine (2). This grip opening (29) is formed by gaps (5) in the side spoilers (3, 19) and a recess (8) in the rear frame (6). Arranged at the recess (8) are the air inlet openings (11, 12, 13, 31, 32) of the air guidance device (9) in which the air filter element (7) for cleaning the intake air of the engine (2) is located.

A plurality of parts that constitute an intake passage connected with an intake port of an engine include a constriction part that has a protrusion formed to protrude on an inner circumferential surface side of the intake passage. The constriction part includes cylindrical connections disposed on both sides of a constriction path in which the protrusion is formed. The constriction path has an outer circumferential surface recessed inwardly in a radial direction so as to follow a shape of the protrusion. A portion recessed most of the recessed outer circumferential surface is disposed inside inner circumferential surfaces of the connections in the radial direction. The constriction path has a uniform wall thickness. The constriction part is connected upstream of the throttle body.

Embodiments include an off-road vehicle with a straddle seat, a plurality of ground engaging members, a prime mover and a frame having a removable frame portion overlying the prime mover, wherein at least a portion of the engine extends above at least a portion of the removable frame portion, and wherein at least a portion of the straddle seat extends over the removable frame portion and the prime mover.

A saddle-ridden vehicle includes: a pair of frame members which are disposed on one side and on other side in a vehicle width direction so as to extend in a vehicle front-rear direction; an engine which is disposed between and supported by the pair of frame members; an air cleaner which cleans air for fuel combustion; a supercharger which compresses the air cleaned by the air cleaner; an intercooler which cools, using a cooling wind, the air compressed by the supercharger and supplies resulting air to the engine; and an exhaust wind duct which determines a discharge position or a discharge direction of the cooling wind discharged from the intercooler, and the exhaust wind duct is disposed above the engine on the one side in the vehicle width direction and extends to rear of the engine.

A portion of a body cover which is not movable relative to a body frame defines a space to guide air to an air cleaner. When a vehicle is in a condition that the body frame is in an upright state and is viewed from the front in a front-rear direction of the body frame, the space is at least partially situated at least one of above a lower end of an upper cross member in an up-down direction of the body frame, on the left of a left edge of a linkage in a left-right direction of the body frame, and on the right of a right edge of the linkage in the left-right direction of the body frame.

A two-wheeled vehicle includes a frame, a plurality of ground-engaging members for supporting the frame, and an engine supported by the frame and operably coupled to the ground-engaging members. Additionally, the two-wheel vehicle includes a down tube extending downwardly from a front end of the frame. A front fairing is supported on the down tube.

In an installation structure of an accelerator position sensor connected to an accelerator grip via an accelerator cable in a straddle-type vehicle, a seat is supported from a lower side of the straddle-type vehicle by a pair of seat rails, an air cleaner case is installed below the pair of seat rails, an outlet tube extends forward from the air cleaner case, an upper surface of the outlet tube is lower than an upper surface of the air cleaner case, and the accelerator position sensor is installed above the outlet tube between the pair of seat rails.