Abstract: A motorcycle includes an exhaust device connected to an engine unit, and the exhaust device includes: a plurality of first exhaust pipes forwardly extending from an exhaust port which opens in the front of the engine unit; a joint portion for joining the first exhaust pipes; a second exhaust pipe connected to a downstream side of the joint portion and passing below an oil pan disposed in a lower portion of the engine unit; and an exhaust expansion chamber connected to a downstream portion of the second exhaust pipe. A cowling of such a motorcycle includes: a front cowling covering the engine unit and the exhaust device from lower and side portions thereof; and a rear cowling partially covering a rider's seat. The front cowling is formed with an air-exhaust opening at a bottom surface of a rear end thereof positioned to a front lower surface of the exhaust expansion chamber.

Abstract: A motorcycle includes an exhaust device connected to an engine unit, and the exhaust device includes: a plurality of first exhaust pipes forwardly extending from an exhaust port which opens in the front of the engine unit; a joint portion for joining the first exhaust pipes; a second exhaust pipe connected to a downstream side of the joint portion and passing below an oil pan disposed in a lower portion of the engine unit; and an exhaust expansion chamber connected to a downstream portion of the second exhaust pipe. A cowling of such a motorcycle includes: a front cowling covering the engine unit and the exhaust device from lower and side portions thereof; and a rear cowling partially covering a rider's seat. The front cowling is formed with an air-exhaust opening at a bottom surface of a rear end thereof positioned to a front lower surface of the exhaust expansion chamber.

Abstract: The overall surface of the upper-cowl body and the headlamp cover attached to the front part thereof are formed with a streamlined, basic cross-sectional shape such as an arc, parabola or some analogous section, which curves with its tangent being gradually directed toward the rear, from the forward part to the rear outer sides. A pair of air intakes opening forward for guiding air for engine supercharging, cooling heat exchanger, etc., are provided on the outer sides of the headlamp cover while a pair of turn signal lenses are arranged on the outer sides of the openings of the air intakes, so that the lens surfaces are projected forward from the basic cross-sectional shape. Air flowing sidewards and rearward along basic cross-sectional shape is guided along the turn signal lens surfaces into the air intakes.