Abstract: A single-cylinder internal combustion engine includes a knock sensor mounted thereto to suppress a temperature increase of the knock sensor and at the same time detect knocking with high accuracy. The engine includes a cylinder block having a cylinder provided therein, and a cylinder head connected to the cylinder block. On a surface of the cylinder block and the cylinder head, one or more fins protruding from the surface are provided. On the surface of the cylinder block, a sensor mounting boss protruding from the surface and being continuous with a portion of the one or more fins is provided. A knock sensor arranged to detect knocking is mounted to the sensor mounting boss.

Abstract: In a single-cylinder internal combustion engine fitted with a knock sensor, a temperature increase of the knock sensor is suppressed and prevented, and the reliability of the knock sensor is improved. The engine includes a crankcase, a cylinder block connected to the crankcase, a cylinder head connected to the cylinder block, a sensor mounting boss provided on the cylinder block, and a knock sensor mounted to the boss. Fins are provided on the cylinder block and the cylinder head. A heat insulation member is provided between the boss and the knock sensor.

Abstract: In a single-cylinder internal combustion engine fitted with a knock sensor, a temperature increase of the knock sensor is suppressed and prevented and the reliability of the knock sensor is improved. The engine includes a crankcase accommodating a crankshaft, a cylinder block connected to the crankcase and including a cylinder provided therein, a cylinder head connected to the cylinder block, a sensor mounting boss provided on the cylinder block, a knock sensor arranged to detect knocking and mounted to the boss, a fan to guide air to at least the sensor mounting boss, and an air shroud.

Abstract: A single-cylinder internal combustion engine includes a knock sensor mounted to apart other than a cylinder block to detect knocking. The engine includes a crankcase, a cylinder block, and a cylinder head connected by a bolt. A boss to mount the knock sensor is provided on the crankcase. A center of the boss is positioned on a same side of a cylinder axis as the bolt, when viewed in an axial direction of the boss.

Abstract: In a single-cylinder internal combustion engine fitted with a knock sensor, a temperature increase of the knock sensor is suppressed and prevented and the reliability of the knock sensor is improved. The engine includes a crankcase accommodating a crankshaft, a cylinder block connected to the crankcase and including a cylinder provided therein, a cylinder head connected to the cylinder block, a sensor mounting boss provided on the cylinder block, a knock sensor arranged to detect knocking and mounted to the boss, a fan to guide air to at least the sensor mounting boss, and an air shroud.

Abstract: In a single-cylinder internal combustion engine fitted with a knock sensor, a temperature increase of the knock sensor is suppressed and prevented, and the reliability of the knock sensor is improved. The engine includes a crankcase, a cylinder block connected to the crankcase, a cylinder head connected to the cylinder block, a sensor mounting boss provided on the cylinder block, and a knock sensor mounted to the boss. Fins are provided on the cylinder block and the cylinder head. A heat insulation member is provided between the boss and the knock sensor.

Abstract: A single-cylinder internal combustion engine includes a knock sensor mounted to apart other than a cylinder block to detect knocking. The engine includes a crankcase, a cylinder block, and a cylinder head connected by a bolt. A boss to mount the knock sensor is provided on the crankcase. A center of the boss is positioned on a same side of a cylinder axis as the bolt, when viewed in an axial direction of the boss.

Abstract: A single-cylinder internal combustion engine includes a knock sensor mounted thereto to suppress a temperature increase of the knock sensor and at the same time detect knocking with high accuracy. The engine includes a cylinder block having a cylinder provided therein, and a cylinder head connected to the cylinder block. On a surface of the cylinder block and the cylinder head, one or more fins protruding from the surface are provided. On the surface of the cylinder block, a sensor mounting boss protruding from the surface and being continuous with a portion of the one or more fins is provided. A knock sensor arranged to detect knocking is mounted to the sensor mounting boss.

Abstract: A split type connecting rod has a simple structure that is capable of suppressing rotation of a metal bearing, and avoiding problems such as burning. The split type connecting rod holds a crank-pin through a metal bearing which has locking lugs. A bearing locking groove locks at least one of the locking lugs when the metal bearing rotates forward in the circumferential direction of a crank-pin hole. A bearing locking groove locks at least one of the locking lugs when the metal bearing rotates backward. The bearing locking grooves are deviated from each other in the circumferential direction.

Abstract: A split type connecting rod has a simple structure that is capable of suppressing rotation of a metal bearing, and avoiding problems such as burning. The split type connecting rod 200 holds a crank-pin through a metal bearing 213 which has locking lugs 213c, 213d. A bearing locking groove 201h locks at least one of the locking lugs 213d when the metal bearing 213 rotates forward in the circumferential direction of a crank-pin hole 101d. A bearing locking groove 201i locks at least one of the locking lugs 213c when the metal bearing 213 rotates backward. The bearing locking grooves 201h, 201i are deviated from each other in the circumferential direction.

Abstract: A split type connecting rod has a simple structure that is capable of suppressing rotation of a metal bearing, and avoiding problems such as burning. The split type connecting rod 200 holds a crank-pin through a metal bearing 213 which has locking lugs 213c, 213d. A bearing locking groove 201h locks at least one of the locking lugs 213d when the metal bearing 213 rotates forward in the circumferential direction of a crank-pin hole 101d. A bearing locking groove 201i locks at least one of the locking lugs 213c when the metal bearing 213 rotates backward. The bearing locking grooves 201h, 201i are deviated from each other in the circumferential direction.

Abstract: A motorcycle and specifically an improved compact air inlet device and filter assembly for a motorcycle. The air inlet device is provided with a relatively large volume but an irregular shape to permit positioning in the area over the engine and beneath the fuel tank. By utilizing a horseshoe-shaped filter element, however, a large filter surface area may be achieved so as to reduce service intervals and to ensure that the engine will operate without flow restriction for a long period of time even if the filter element is not serviced.