A side cover structure includes a main frame extending rearward from a head pipe, a seat rail positioned behind the main frame, a side cover fixed to the seat rail from an inner side in a vehicle width direction. Below a driver seating surface of a seat on the seat rail, the side cover is exposed, to an outer side in the vehicle width direction, from an opening formed by rail members included in the seat rail.

An all-terrain vehicle (ATV) has a frame having front and rear ends, an internal combustion engine connected to the frame, the engine including a front portion and a rear portion, a single cylinder defining a cylinder axis, an air intake port defined in the front portion facing towards the front end of the frame, and an exhaust port defined in the rear portion facing towards the rear end of the frame. The ATV further has an exhaust assembly fluidly connected to the exhaust port. The exhaust assembly extends from the engine towards the rear end of the frame. The ATV further has a continuously variable transmission operatively connected to the engine, which includes a primary pulley being operatively connected to the engine, a secondary pulley, a drive belt looped around the primary and secondary pulleys, and a housing enclosing the primary pulley, the secondary pulley, and the drive belt.

An all-terrain vehicle (ATV) has a frame having front and rear ends, an internal combustion engine connected to the frame, the engine including a front portion and a rear portion, a single cylinder defining a cylinder axis, an air intake port defined in the front portion facing towards the front end of the frame, and an exhaust port defined in the rear portion facing towards the rear end of the frame. The ATV further has an exhaust assembly fluidly connected to the exhaust port. The exhaust assembly extends from the engine towards the rear end of the frame. The ATV further has a continuously variable transmission operatively connected to the engine, which includes a primary pulley being operatively connected to the engine, a secondary pulley, a drive belt looped around the primary and secondary pulleys, and a housing enclosing the primary pulley, the secondary pulley, and the drive belt.

A straddle-type vehicle (100) includes a frame (20) and an engine (10) mounted on the frame (20), the engine (10) includes a cylinder head (11) positioned toward the rear end of the frame, and located below a saddle seat (80). The cylinder head laces toward the rear end of the frame, which allows the heated cylinder head of the engine and the exhaust pipe connected to the cylinder head to avoid contact with the vehicle the user's legs while riding the vehicle, so the effect of heat emitted from the cylinder head on the rider's experience is reduced.

A straddle-type vehicle (100) includes a frame (20) and an engine (10) mounted on the frame (20), the engine (10) includes a cylinder head (11) positioned toward the rear end of the frame, and located below a saddle seat (80). The cylinder head laces toward the rear end of the frame, which allows the heated cylinder head of the engine and the exhaust pipe connected to the cylinder head to avoid contact with the vehicle the user's legs while riding the vehicle, so the effect of heat emitted from the cylinder head on the rider's experience is reduced.

A vehicle that can secure both stable communication by an ECU including a communication unit that unlocks a handlebar lock module and theft prevention. The vehicle includes a steering shaft, a vehicle body frame including a head pipe that turnably supports the steering shaft and a seat rail that is disposed below a seat on which a rider is seated to fix the seat, and a communication unit for communicating with a smart key (a device external to the vehicle). The communication unit is provided below and on the outer side in a vehicle width direction of the seat rail and in a space covered by and on the inner side of a side cover (vehicle body cover) that protects a vehicle body part.

A vehicle includes: an internal combustion engine used for traveling and including a crank case and a cylinder block connected to the crank case; an air cleaner that purifies intake air to be supplied to the internal combustion engine; and a breather tube that is connected to the crank case and the air cleaner and supplies a gas in the crank case toward the air cleaner. A connection portion between the breather tube and the crank case is located at a first side of a vehicle width direction middle of the cylinder block in a vehicle width direction.

A motorcycle includes a fuel tank, an engine, an air cleaner box, and an electrical component unit. The fuel tank stores a fuel. The engine is driven by the fuel stored in the fuel tank. The air cleaner box purifies air to be supplied to the engine. The electrical component unit includes two or more types of electrical components driven by electricity. The fuel tank and the engine are arranged vertically one above the other. At least part of the air cleaner box is positioned in a space between the fuel tank and the engine. The longitudinal position of at least part of the electrical component unit is more frontward than the rear end of the fuel tank and more rearward than the air cleaner box.

A straddle-type vehicle (100) includes a frame (20) and an engine (10) mounted on the frame (20), the engine (10) includes a cylinder head (11) positioned toward the rear end of the frame, and located below a saddle seat (80). The cylinder head faces toward the rear end of the frame, which allows the heated cylinder head of the engine and the exhaust pipe connected to the cylinder head to avoid contact with the vehicle the user's legs while riding the vehicle, so the effect of heat emitted from the cylinder head on the rider's experience is reduced.

A straddle-type vehicle (100) includes a frame (20) and an engine (10) mounted on the frame (20), the engine (10) includes a cylinder head (11) positioned toward the rear end of the frame, and located below a saddle seat (80). The cylinder head faces toward the rear end of the frame, which allows the heated cylinder head of the engine and the exhaust pipe connected to the cylinder head to avoid contact with the vehicle the user's legs while riding the vehicle, so the effect of heat emitted from the cylinder head on the rider's experience is reduced.