All-terrain vehicle

An all-terrain vehicle comprising:

• a frame having a front end and a rear end defined consistently with a forward travel direction of the all-terrain vehicle;
• an internal combustion engine connected to the frame, the internal combustion engine including:
• a front portion and a rear portion;
• a single cylinder defining a cylinder axis;
• an air intake port defined by the single cylinder, in the front portion and facing towards the front end of the frame;
• and
• an exhaust port defined by the single cylinder, in the rear portion and facing towards the rear end of the frame;
• an exhaust assembly fluidly connected to the exhaust port, the exhaust assembly extending from the internal combustion engine towards the rear end of the frame;
• a continuously variable transmission operatively connected to the internal combustion engine, the continuously variable transmission including:
• a primary pulley having a rotation axis, the primary pulley being operatively connected to the internal combustion engine;
• a secondary pulley having a rotation axis, the secondary pulley being disposed rearward of the primary 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, the housing having a top end and a bottom end;
• a straddle seat connected to the frame, the internal combustion engine being disposed under the straddle seat;
• a first footrest disposed on a first side of a longitudinal center plane of the all-terrain vehicle;
• and
• a second footrest disposed on a second side of the longitudinal center plane;
• the exhaust assembly including an exhaust pipe, at least one portion of the exhaust pipe being disposed vertically between the top end and the bottom end of the housing of the continuously variable transmission, and at least one portion of the exhaust pipe extending within a circumference of a cylindrical surface defined by a perimeter of the secondary pulley.

An all-terrain vehicle comprising:

• a frame having a front end and a rear end defined consistently with a forward travel direction of the all-terrain vehicle;
• an internal combustion engine connected to the frame, the internal combustion engine including:
• a front portion and a rear portion;
• a single cylinder defining a cylinder axis;
• an air intake port defined by the single cylinder, in the front portion and facing towards the front end of the frame;
• and
• an exhaust port defined by the single cylinder, in the rear portion and facing towards the rear end of the frame;
• an exhaust assembly fluidly connected to the exhaust port, the exhaust assembly extending from the internal combustion engine towards the rear end of the frame;
• a continuously variable transmission operatively connected to the internal combustion engine, the continuously variable transmission including:
• a primary pulley having a rotation axis, the primary pulley being operatively connected to the internal combustion engine;
• a secondary pulley having a rotation axis, the secondary pulley being disposed rearward of the primary 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, the housing having a top end and a bottom end;
• a straddle seat connected to the frame, the internal combustion engine being disposed under the straddle seat;
• a first footrest disposed on a first side of a longitudinal center plane of the all-terrain vehicle;
• a second footrest disposed on a second side of the longitudinal center plane;
• and
• a portion of the exhaust port being below a horizontal plane passing through a top end of the secondary pulley.