An apparatus and methods are provided for an air cleaner to be mounted onto an air inlet of an internal combustion engine. The air cleaner comprises an air filter that includes a filter medium disposed between a curved base and a cover. The curved base provides an interface between the air filter and the air inlet, and comprises a shape that provides clearance between the curved base and an electric choke installed onto a carburetor comprising the air inlet. The cover secures the air filter and the curved base to the air inlet such that an airstream is drawn through the filter medium and is conducted into the air inlet. A raised portion of the cover is configured to cooperate with the curved base to ensure a desired volume of the airstream is available to the air inlet at substantially all engine speeds.

There is provided a straddle-type vehicle, including: a pair of seat frames; a seat; an air cleaner; a battery; and a bracket. A rear portion of the air cleaner and the battery are positioned below the seat. The battery is disposed above the rear portion of the air cleaner. The bracket extends in a left-right direction of the straddle-type vehicle and passes between the rear portion of the air cleaner and the battery. A left end side and a right end side of the bracket are connected to the pair of seat frames respectively. The rear portion of the air cleaner is suspended by the bracket. The battery is installed on the bracket.

An apparatus and a method are provided for an air box configured to cool an engine control unit (ECU) by way of an airstream being communicated to an air intake system of an internal combustion engine of a vehicle. The air box is comprised of a housing to support an air filter within an interior of the housing. An opening in the housing fixedly receives at least one surface of the ECU to transfer heat from the ECU to the airstream. A mount portion within the housing receives the air filter. A conduit to a clean side of the air filter is configured to be coupled with the air intake system. An inlet to the housing is configured to couple with an air inlet duct of the vehicle so as to direct the airstream into the interior of the housing.

There is provided an air cleaner configured to be disposed behind an engine and inside a vehicle body frame. The air cleaner includes: an air cleaner case in which an intake chamber is formed; an air filter that divides the intake chamber into a dirty side and a clean side; an inlet tube configured to take in air from a vehicle rear side to the dirty side; and an outlet tube configured to send air from the clean side to the engine. The inlet tube and the outlet tube are attached to an upper side of the air cleaner case, and an expansion portion is formed on a lower side of the air cleaner case, the expansion portion being formed by expanding the clean side further downward than the dirty side.

An apparatus and methods are provided for an air cleaner to be mounted onto an air inlet of an internal combustion engine. The air cleaner comprises an air filter that includes a filter medium disposed between a curved base and a cover. The curved base provides an interface between the air filter and the air inlet, and comprises a shape that provides clearance between the curved base and an electric choke installed onto a carburetor comprising the air inlet. The cover secures the air filter and the curved base to the air inlet such that an airstream is drawn through the filter medium and is conducted into the air inlet. A raised portion of the cover is configured to cooperate with the curved base to ensure a desired volume of the airstream is available to the air inlet at substantially all engine speeds.

An apparatus and a method are provided for an air box configured to cool an engine control unit (ECU) by way of an airstream being communicated to an air intake system of an internal combustion engine of a vehicle. The air box is comprised of a housing to support an air filter within an interior of the housing. An opening in the housing fixedly receives at least one surface of the ECU to transfer heat from the ECU to the airstream. A mount portion within the housing receives the air filter. A conduit to a clean side of the air filter is configured to be coupled with the air intake system. An inlet to the housing is configured to couple with an air inlet duct of the vehicle so as to direct the airstream into the interior of the housing.

Methods and systems are provided for an air intake apparatus. In one example, a system comprises an air filter box rotatably mounted to an intake manifold. The air filter box rotates about an axis angled to a direction of forward vehicle travel.

An intake assembly for an internal-combustion engine includes an intake duct for each cylinder, which communicates with an airbox that includes a filtering element. Each intake duct communicates with the airbox by a respective throttle body. A monitoring channel connects the intake ducts together and is configured for perturbing in a negligible way the dynamics of the fluid inside the intake ducts. Associated to said monitoring duct are sensors for monitoring the pressure inside the monitoring duct and designed to send signals indicating the value of pressure of the fluid taken in by the engine to an electronic control unit.

A motorcycle including a protection cover for a throttle body that is less likely to contribute to an increase in the vehicle weight to thus improve the attachability thereof. A motorcycle includes a throttle body provided with a throttle valve for controlling a flow rate of intake air into an internal combustion engine and an air cleaner for supplying air to the throttle body. The throttle body is arranged at a rear of the air cleaner with an intake port of the internal combustion engine being arranged at a rear of the throttle body. The air cleaner includes a throttle body protecting section for covering at least a lower surface of the throttle body.

An air pre-cleaner spin tube includes a vaned inlet section including an inlet flange, and an outer tube inlet portion including an outer wall forming a nozzle that defines a radial direction, and a longitudinal axis. Also, a central stem is disposed in the nozzle, and a plurality of vanes extends from the central stem to the outer wall.