An engine apparatus includes an engine, an exhaust gas purification device, an outlet side bracket, and an inlet side bracket. The exhaust gas purification device is mounted above a cylinder head to extend along an axis of an output shaft of the engine. The inlet side bracket is configured to couple an exhaust gas inlet side of the exhaust gas purification device to the cylinder head. The inlet side bracket includes a first bracket, a second bracket, and a third bracket. The first bracket is configured to be secured to a surface of the cylinder head intersecting the axis of the output shaft and includes a wide width. The second bracket includes a proximal end portion and a distal end portion. The third bracket is configured to be coupled to an end surface of the exhaust gas purification device and the distal end portion of the second bracket.

A method of remanufacturing a prechamber assembly includes determining a width W of an original circumferential weld bead that extends around and joins a proximal end of an outer peripheral wall of a prechamber housing and a distal end of an outer peripheral wall of a body assembly, cutting through the weld bead in order to separate the prechamber housing from the body assembly, and removing material from an outer peripheral portion of a distal end portion of the body assembly. The method includes removing the material in an axial direction parallel to the central axis of the prechamber assembly for a distance that is from 2.5-3 times the width W.

An anti-vibration coupling system for a cover of an engine includes: a plastic pin with a semi-spherical head and reinforcement; a metal pin connected to the engine, with a threaded body and first head, with polygonal section, including a second head with circular section; a damping element with a first inlet end with a first semi-spherical recess for engagement with the head, and a second opposite end, with a second recess and a third recess, mutually coaxial, for engaging the first and second heads of the metal pin. The damping element includes, on the outer surface thereof, with an elasticizing ring, constituted by at least one circular loop that is suitably sized and positioned on the lateral surface in order to increase the elasticity of the damping element in a pre-established point. The damping element also includes through holes in order to further increase the elasticity thereof.

An anti-vibration coupling system for a cover of an engine includes: a plastic pin with a semi-spherical head and reinforcement; a metal pin connected to the engine, with a threaded body and first head, with polygonal section, including a second head with circular section; a damping element with a first inlet end with a first semi-spherical recess for engagement with the head, and a second opposite end, with a second recess and a third recess, mutually coaxial, for engaging the first and second heads of the metal pin. The damping element includes, on the outer surface thereof, with an elasticizing ring, constituted by at least one circular loop that is suitably sized and positioned on the lateral surface in order to increase the elasticity of the damping element in a pre-established point. The damping element also includes through holes in order to further increase the elasticity thereof.

There is provided a balancer device for an internal combustion engine that suppresses lubricating oil from failing onto a reduction gear and a pump drive gear provided to drive and rotate an oil pump and thereby suppresses an increase in resistance against rotation between the reduction gear and the pump drive gear. The balancer device for the internal combustion engine includes a lower side housing on which a balancer drive gear, a first balancer shaft including a first balance weight, a first gear, a second gear, a second balancer shaft including a second balance weight, and the reduction gear are mounted. The balancer device also includes an upper side housing formed in such a shape that covers the balancer drive gear, the first balancer shaft including the first balance weight, the first gear, the second gear, the second balancer shaft including the second balance weight, the reduction gear, and the pump drive gear from above in the state that the oil pump is assembled with the upper side housing such that the pump drive gear is meshed with the reduction gear. The upper side housing is assembled with the lower side housing. The balancer device further includes an exposure opening formed in the upper side housing such that only the balancer drive gear is exposed from the upper side housing to be meshed with an engine-side gear.

A tractor including an intake pipe for supplying intake air to an intake unit of an engine body, and an engine harness for electrically connecting the engine body and an engine controller to each other. The intake pipe is provided with a rib formed along the longitudinal direction of the intake pipe, and the engine harnesses is partially supported by the rib.

A tractor including an intake pipe for supplying intake air to an intake unit of an engine body, and an engine harness for electrically connecting the engine body and an engine controller to each other. The intake pipe is provided with a rib formed along the longitudinal direction of the intake pipe, and the engine harnesses is partially supported by the rib.

An engine includes: a crankcase; a cover that is connected to the crankcase at a mating surface of the cover inclined toward an inner side in a vehicle width direction in going downward when the engine is mounted to a vehicle body, the cover covering a protruding end of a rotary shaft; and attachment bosses that are formed to be integral with the cover, have a predetermined height from the mating surface, and accept fastening members for fastening the cover to the crankcase. Accordingly, when mounted on a two-wheeled motor vehicle, the engine can restrain protrusion in the vehicle width direction and can be disposed at a position as low as possible with reference to the vehicle.

To provide a vehicle that includes a balancer mechanism for reducing vibration of the engine and can leave a space margin for increasing the fuel tank in size and/or arranging equipment or components at the rear of the cylinder and above the crankcase. A vehicle includes: an engine mounted on a body frame. The engine comprises a crankcase with a ceiling wall, a crankshaft provided in the crankcase, and a balancer mechanism for reducing vibration of the engine by power transmitted from the crankshaft. The balancer mechanism comprises an idler gear disposed behind the crankshaft and rotated by power transmitted from the crankshaft, and a first balancer disposed behind the idler gear and rotated by power transmitted from the idler gear. The idler gear and the first balancer are disposed along the ceiling wall.

To provide a vehicle that includes a balancer mechanism for reducing vibration of the engine and can leave a space margin for increasing the fuel tank in size and/or arranging equipment or components at the rear of the cylinder and above the crankcase. A vehicle includes: an engine mounted on a body frame. The engine comprises a crankcase with a ceiling wall, a crankshaft provided in the crankcase, and a balancer mechanism for reducing vibration of the engine by power transmitted from the crankshaft. The balancer mechanism comprises an idler gear disposed behind the crankshaft and rotated by power transmitted from the crankshaft, and a first balancer disposed behind the idler gear and rotated by power transmitted from the idler gear. The idler gear and the first balancer are disposed along the ceiling wall.