Abstract: An exhaust system for a straddle-type vehicle, such as a motorcycle, which achieves miniaturization and also provides a reduced noise output. The exhaust system is connectable to an engine of an associated vehicle and includes an exhaust pipe and a silencer. The silencer comprises an outer housing and an inner core accommodated in the outer housing. A sound absorbing material is arranged on an outer surface of a side wall of the inner core in a manner to come into close contact therewith. An air space is provided between an outer surface of the sound absorbing material and an inner surface of the outer housing.

Abstract: An exhaust system for a vehicle, such as a motorcycle or other straddle-type vehicle, that achieves miniaturization while providing advantageous noise reduction characteristics. The exhaust system is associated with an engine of a vehicle and includes an exhaust pipe connected to the engine and a silencer. A conical member is positioned within the silencer and includes an upstream end and a downstream end. At least a portion of a side wall of the conical member includes a plurality of through-holes. The conical member is oriented such that a radial dimension of the conical member increases in a direction from the upstream end to the downstream end.

Abstract: An exhaust system for a straddle-type vehicle that achieves miniaturization while meeting a demand for noise reducing characteristics. The exhaust system is connectable to an engine, and includes an exhaust pipe connectable to the engine and a silencer. The exhaust system further comprises a tail pipe inserted into the silencer 10. The silencer comprises an outer housing and an inner core accommodated in the outer housing. An air space is provided between the tail pipe and the inner core.

Abstract: An exhaust system for a straddle-type vehicle that achieves miniaturization while meeting a demand for noise reducing characteristics. The exhaust system is connectable to an engine, and includes an exhaust pipe connectable to the engine and a silencer. The exhaust system further comprises a tail pipe inserted into the silencer 10. The silencer comprises an outer housing and an inner core accommodated in the outer housing. An air space is provided between the tail pipe and the inner core.

Abstract: An exhaust system for a straddle-type vehicle, such as a motorcycle, that is compact while also reducing noise output. The exhaust system communicates with an engine of an associated vehicle. The exhaust system includes an exhaust conduit, which is at least partially defined by an exhaust pipe, communicating with a combustion chamber of the engine. The exhaust system also includes a silencer. A ratio of a volume of the silencer to a volume of the exhaust conduit is between about 0.7 to 1.4. In some arrangements, the volume of the silencer and the volume of the exhaust conduit are substantially equal to each other.

Abstract: An exhaust system for a straddle-type vehicle, such as a motorcycle, which achieves miniaturization and also provides a reduced noise output. The exhaust system is connectable to an engine of an associated vehicle and includes an exhaust pipe and a silencer. The silencer comprises an outer housing and an inner core accommodated in the outer housing. A sound absorbing material is arranged on an outer surface of a side wall of the inner core in a manner to come into close contact therewith. An air space is provided between an outer surface of the sound absorbing material and an inner surface of the outer housing.

Abstract: An exhaust system for a vehicle, such as a motorcycle or other straddle-type vehicle, that achieves miniaturization while providing advantageous noise reduction characteristics. The exhaust system is associated with an engine of a vehicle and includes an exhaust pipe connected to the engine and a silencer. A conical member is positioned within the silencer and includes an upstream end and a downstream end. At least a portion of a side wall of the conical member includes a plurality of through-holes. The conical member is oriented such that a radial dimension of the conical member increases in a direction from the upstream end to the downstream end.

Abstract: An engine starting device includes an air-intake flow channel in which air sucked by an engine flows. A throttle valve is provided in the air-intake flow channel for controlling airflow. An air channel bypassing the throttle valve and communicating the air-intake flow channel between an upstream side and a downstream side of the throttle valve is also provided. The air channel includes a first channel portion and a second channel portion. A first opening-closing valve opens and closes the first channel portion of the air channel and a control device controls the first opening-closing valve. The engine starting device also includes a second opening-closing valve opening and closing the second channel portion and the first channel portion. The control device determines a starting state of the engine, controls the first opening-closing valve to open the first channel portion when the engine is not in the starting state and to close the first channel portion after the engine has started.

Abstract: An engine starting device includes an air-intake flow channel in which air sucked by an engine flows. A throttle valve is provided in the air-intake flow channel for controlling airflow. An air channel bypassing the throttle valve and communicating the air-intake flow channel between an upstream side and a downstream side of the throttle valve is also provided. The air channel includes a first channel portion and a second channel portion. A first opening-closing valve opens and closes the first channel portion of the air channel and a control device controls the first opening-closing valve. The engine starting device also includes a second opening-closing valve opening and closing the second channel portion and the first channel portion. The control device determines a starting state of the engine, controls the first opening-closing valve to open the first channel portion when the engine is not in the starting state and to close the first channel portion after the engine has started.