A motorcycle includes a supercharger to pressurize an intake air and supplying it to a combustion engine and an air intake chamber disposed downstream of the supercharger. The air intake chamber is made of a metallic material and has a capacity of an interior space thereof which is within the range of three to eight times the displacement of the combustion engine. The dimension from an upstream end portion on an inlet side of the interior space of the air intake chamber to a downstream end portion on an outlet side of the interior space of such air intake chamber is chosen to be three or more times the inner diameter of an outlet.

A motorcycle includes a supercharger to pressurize an intake air and supplying it to a combustion engine and an air intake chamber disposed downstream of the supercharger. The air intake chamber is made of a metallic material and has a capacity of an interior space thereof which is within the range of three to eight times the displacement of the combustion engine. The dimension from an upstream end portion on an inlet side of the interior space of the air intake chamber to a downstream end portion on an outlet side of the interior space of such air intake chamber is chosen to be three or more times the inner diameter of an outlet.

A two-wheeled vehicle is provided including a frame, front and rear ground-engaging members each supporting the frame, a straddle-type seat, a handlebar for steering the vehicle, at least one light device configured to operate in a hazard mode, an engine supported by the frame and operably coupled to the ground-engaging members, a tilt sensor, and a vehicle control unit in communication with the tilt sensor. The vehicle control unit is operative to detect a tilt angle of the vehicle based on output from the tilt sensor. The vehicle control unit is operative to determine a tip-over condition of the vehicle based on the detected tilt angle exceeding a threshold tilt angle. The vehicle control unit activates the hazard mode of the at least one light in response to the determination of the tip-over condition.

A vehicle body frame structure for a saddled vehicle is provided in which a rear frame supporting a riding seat is formed from a fiber-reinforced resin and is linked to a front frame supporting an engine so as to extend to the rear from the front frame, wherein the rear frame is formed by joining a pair of left and right side walls, an upper cross member linking upper parts of the two side walls, and a lower cross member linking lower parts of the two side walls. This enables a rear frame to be produced with enhanced productivity while avoiding poor yield.

A vehicle body frame structure for a saddled vehicle is provided in which a rear frame supporting a riding seat is formed from a fiber-reinforced resin and is linked to a front frame supporting an engine so as to extend to the rear from the front frame, wherein the rear frame is formed by joining a pair of left and right side walls, an upper cross member linking upper parts of the two side walls, and a lower cross member linking lower parts of the two side walls. This enables a rear frame to be produced with enhanced productivity while avoiding poor yield.

An air intake chamber is disposed at a location downstream of a supercharger and upstream of a throttle body. The air intake chamber serves to accumulate an intake air pressurized by the supercharger. This air intake chamber includes a confronting portion, which has an outlet and overlaps the throttle body, and a connecting portion that connects between the confronting portion and a discharge port of the supercharger. The connecting portion has an outlet side opening set to be larger than an inlet side opening thereof.

An air intake chamber is disposed at a location downstream of a supercharger and upstream of a throttle body. The air intake chamber serves to accumulate an intake air pressurized by the supercharger. This air intake chamber includes a confronting portion, which has an outlet and overlaps the throttle body, and a connecting portion that connects between the confronting portion and a discharge port of the supercharger. The connecting portion has an outlet side opening set to be larger than an inlet side opening thereof.

A body cover construction for a motorcycle includes a body cover having a front mudguard which covers an outer circumference of a front wheel, a front cover covering a front portion of a vehicle body from a front to sides of a headstock, floorboards extending from a lower rear portion of the front cover to below a seat so that rider's feet rest thereon, and underside covers covering sides of the vehicle body lying below and forwards of the floorboards. When the vehicle body is seen from a side, a lower edge portion of a front side surface of the front cover extends in a longitudinal direction and is at a similar level as a lower edge portion of a mudguard side surface of the mudguard. A front upper end portion of the underside cover extends upwards to a position which is a predetermined distance from the lower edge portion.

A body cover construction for a motorcycle includes a body cover having a front mudguard which covers an outer circumference of a front wheel, a front cover covering a front portion of a vehicle body from a front to sides of a headstock, floorboards extending from a lower rear portion of the front cover to below a seat so that rider's feet rest thereon, and underside covers covering sides of the vehicle body lying below and forwards of the floorboards. When the vehicle body is seen from a side, a lower edge portion of a front side surface of the front cover extends in a longitudinal direction and is at a similar level as a lower edge portion of a mudguard side surface of the mudguard. A front upper end portion of the underside cover extends upwards to a position which is a predetermined distance from the lower edge portion.

A single-track and engine-operated motor vehicle is provided. The motor vehicle includes a frame support structure that receives at least one engine in a fastening manner. The frame support structure includes frame elements and at least one supporting cladding part made of fiber reinforced plastic. The overall stiffness of the frame support structure is determined by the at least one supporting cladding part.