Abstract: A seat frame for a motorcycle includes a plurality of aluminum parts manufactured with different manufacturing methods. A seat frame includes front members, middle members, and a rear member, the front members, the middle members, and the rear member being formed of aluminum. The rear member is formed by integral molding based on a gravity casting method. The rear member includes a pair of left and right rail portions, a front cross portion, a rear cross portion, and a plurality of attachment bosses for attaching other parts. The left and right rail portions each have an attachment portion to be connected to a rear end portion of corresponding one of the middle members provided on an end portion thereof on the front side in the vehicle longitudinal direction.

Abstract: A top case arrangement for a vehicle, in particular a motorcycle or a motor-cycle like vehicle, and a vehicle having such a top case, are provided. The top case arrangement includes a top-case, and a base support arranged below the top case. The base support connects to the vehicle structure and includes connecting sections for selectively connecting armrests to the base support. The top case includes in the region of the lower side, at least one cavity in which both connecting sections are arranged when the top case is in an installed position on the vehicle.

Abstract: A resin part for a vehicle includes a fender main body formed of a fiber-reinforced resin using a resin fiber, and a fastening section formed of the same resin material as the resin fiber, formed integrally with the fender main body and fastened to the vehicle body.

Abstract: A motor vehicle, in particular a motorcycle or a motorcycle-like vehicle, includes a wheel suspension supporting the vehicle frame with a spring assembly. The wheel suspension is designed to compress in a compression direction and to rebound in an opposite rebound direction. The wheel suspension includes a lowering device which can be selectively actuated by a pressure fluid in an active state to apply a preload to the wheel suspension to alter a ride height of the motor vehicle.

Abstract: There is provided a motorcycle. A side stand is disposed at a side-lower portion of an engine and configured to be rotatable between a using position at which the side stand can be grounded to a ground surface and a retraction position at which the side stand cannot be grounded to the ground surface. An inflow piping is configured to supply cooling water delivered from a water pump to a supercharger. An outflow piping is disposed above the supercharger and configured to return the cooling water having cooled the supercharger to the water pump. The outflow piping is provided to be horizontal or to have an upward gradient from an upstream side toward a downstream side in a state where the side stand is displaced to the using position to be grounded to the ground surface and the engine is inclined toward the side stand-side.

Abstract: A motorcycle body frame structure improves rigidity and further suppresses changes in vehicle body behavior. The body frame structure includes: a head pipe, right and left main frames connected to the head pipe, a down tube connected to the head pipe, right and left reinforcing frames installed between the down tube and corresponding right and left reinforcing frames. Each of the right and left reinforcing frames include a first and second joint portions joined to the down tube. The first joint portions are joined with corresponding right and left main frames. Each of the second joint portions include a first joint flange portion welded with corresponding right and left side surfaces of the down tube, a second joint flange portion welded with an upper surface of the down tube, and a third joint flange portion connected with the first and second joint flange portions and separated from the down tube.

Abstract: A universal protector for a bicycle element made up of a shell for protecting the element and a fastener for fastening the shell to the element in which the shell includes a size adapting and adjusting structure to accommodate bicycle elements of different sizes thereby protecting the bicycle and vehicles during transport.

Abstract: In a vehicle, a rod of a waste gate valve actuator reciprocates along a virtual plane which is parallel to both the central axis of a connecting shaft of a turbocharger and the cylinder axis of a cylinder hole. When viewed in the left or right direction of the vehicle, a main catalyst of a catalyst portion is provided forward of the cylinder axis of the cylinder hole. The flow direction of the exhaust gas in the main catalyst intersects with the reciprocating direction of the rod of the waste gate valve actuator when viewed in a direction orthogonal to both the central axis of the connecting shaft of the turbocharger and the central axis of the cylinder hole.

Abstract: An electrical starter system and construction kit for retrofitting Harley-Davidson motorcycles built from 1936 to 1957 with a mechanical starting device. The starter system includes a clutch device that can be coupled to the transmission main shaft for transmitting rotary motion having at least one starter gearwheel, a clutch hub, a clutch cage that can be or is attached to the hub for transmitting a rotary motion and an electrical starter motor with a starter shaft pinion that can be driven by the electrical motor for engaging the starter gearwheel. The starter gearwheel can be mechanically coupled to the clutch hub for transmitting a rotary motion to the hub. Preferably, a gearwheel/hub adapter couples the clutch hub and the starter gearwheel. The adapter is or can be coupled to the starter gearwheel and the clutch hub and is or can be coupled to a transmission main shaft.

Abstract: A wheelie determining device comprises a lift-off start determiner section which determines whether or not a lift-off of a front wheel from a ground surface has started, based on a traveling state value indicating a traveling state of a vehicle and an operation value indicating a rider's driving operation.

Abstract: A vehicle height adjustment device includes front forks, a rear suspension, a weight estimation unit, and a front wheel-side target movement amount determination unit. The front fork includes a front wheel-side suspension spring and a front wheel-side support member, which supports one end of the front wheel-side suspension spring, and moves toward another end of the front wheel-side spring to change the front wheel-side suspension spring length. The rear suspension includes a rear wheel-side suspension spring and a rear wheel-side support member, which supports one end of the rear wheel-side suspension spring, and moves toward another one end of the rear wheel-side spring to change the rear wheel-side suspension spring length. The weight estimation unit estimates a weight applied to a vehicle. The front wheel-side target movement amount determination unit decreases, a movement amount of the front wheel-side support member as the estimated weight increases.

Abstract: An electric handle lock structure for a saddled vehicle which can provide a compact arrangement around a handle to thereby achieve miniaturization of a vehicle body front portion. A handle lock structure for a saddled vehicle includes: a handle steering shaft operated by a handle; a front wheel steering shaft disposed to steer a front wheel in front of the handle steering shaft; a top bridge which is fastened to an upper end of the handle steering shaft and to which the handle is fixed; and an electric handle lock device that is electrically operated and is provided between the handle steering shaft and the front wheel steering shaft in the proximity of the handle, and the electric handle lock device is disposed so that at least part thereof overlaps below the top bridge in a plan view.

Abstract: A straddle type vehicle includes a body frame, and a rear fender attached to the body frame. The rear fender has a fitting portion fitted to a fitted portion of the body frame to be held by the body frame, and a fixing portion fixed to the body frame by a fixing member in a fitted state in which the fitting portion is fitted to the fitted portion.

Abstract: A straddled vehicle includes a cross frame connected to a left main frame and a right main frame. As the vehicle is seen from the side, a centroid of a central cross section in a vehicle width direction of the cross frame is located within an area that is delimited by an upper extension obtained by extending rearward an upper outline of the left connecting frame, a lower extension obtained by extending rearward a lower outline of the left connecting frame, an upper outline of the left main frame and a lower outline of the left main frame.

Abstract: A swing arm secures rigidity, and is lighter than a conventional swing arm, includes a hollow body with a pivot hole in which a pivot shaft is disposed, a suspension fixing portion in the body connected to one end portion of a suspension unit, and a pair of arms extending from the body and supporting respective ends of a wheel axle. Each of the pair of arms includes an outer member having an open cross-section and an inner member having an open cross-section. The outer member and the inner member of each of the arms are joined at respective open end portions. The body includes first opening portions joined with a corresponding one edge portion of the outer member of the arms, second opening portions joined with a corresponding outer surface of the inner member of the arms, and reinforcing support-struts that partition the first and second opening portions.

Abstract: In a support structure of a drive shaft in which a power transmission mechanism transmitting the power of a power source and a driving wheel are fixed to a drive shaft rotatably supported by a support portion provided in a vehicle, a female screw portion is formed in the inner peripheral surface of a hollow portion formed at an end portion of the drive shaft. The power transmission mechanism is fixed to the drive shaft by fastening a bolt screwed with the female screw portion. A step portion is provided between a small-diameter portion and a large-diameter portion formed on the outer peripheral surface of the drive shaft. The position in the axial direction of the power transmission mechanism fixed to the small-diameter portion side is regulated by the step portion.

Abstract: A front fork of the present invention has: a cylinder in which a damper of one fork leg is connected to an outer tube on a vehicle body side; a piston rod connected to an inner tube on an axle side; and a piston valve attached to the piston rod and movably inserted into the cylinder. A variable throttle for extension-side damping force adjustment is provided in the piston rod. A stroke sensor has a detected element attached to the cylinder, and a detection unit that is attached to the piston rod and detects a displacement of the detected element. A variable throttle for compression-side damping force adjustment is attached to an outer tube on the vehicle body side of another fork leg.

Abstract: A vehicle body includes a vehicle body frame and a steering rotation unit that is supported on the vehicle body frame and that rotates about a steering axis. The vehicle includes a variable trail length mechanism. The variable trail length mechanism varies a trail length of a front wheel and includes an oscillation unit and a torsion reduction portion. The oscillation unit is connected with the steering rotation unit so as to be oscillatable in a fore-aft direction and supports the front wheel. The torsion reduction portion reduces torsion of the oscillation unit in a vehicle width direction through the oscillation unit combined with the steering rotation unit under a condition in which the trail length is changed such that the front wheel is disposed at a rearmost position.

Abstract: A bike having an expanded knife ski device includes left and right landing wheel arms on the left and right portions of the bike, respectively. Left and right landing wheels are rotatably coupled to the lower end of the left and right landing wheel arm, respectively, to move the landing wheels up and down. Left and right driving units lift and lower the left and right landing wheels, respectively. Left and right ski mounting sockets are coupled to the left and right landing wheel arms, respectively. Left and right insertion members couple to the left and right ski mounting sockets, respectively. Left and right ski legs are integrally coupled to the left and right insertion members, respectively, to extend downwards. Left and right bike skis, which are hinge-coupled to the lower end of the left and right ski legs, respectively, each making a hinge movement about a left/right horizontal axis.

Abstract: A saddle-riding vehicle include a body frame, an engine which is supported on the body frame, an exhaust pipe which extends rearward from a front portion of the engine 41, a fuel tank which is disposed on a side of the engine 41, a skid guard which covers the engine and the exhaust pipe from fronts thereof, and a side guard which covers a side portion of the fuel tank. The skid guard and the side guard are disposed to have an overlap portion where the skid guard and the side guard overlap partially. Therefore, the saddle-riding vehicle prevents mud or stone from entering an inside of a guard member, and prevents a fuel tank from being exposed through a gap to eliminate a deterioration of an external design of the saddle-riding vehicle.

Abstract: In order to improve a wheel unit for a bicycle, comprising a hub and a wheel rim, which is arranged rotatably about an axis of rotation, wherein the hub and the wheel rim are connected to one another by spokes, it is proposed to arrange a brake disc and a sensor ring comprising a sensing region on the hub and to arrange the sensor ring adjacent to the brake disc.

Abstract: A vehicle raking assembly is provided. The assembly includes an upper member, a lower member, a frame fixation member configured to extend through a neck portion of a vehicle frame, and a central member disposed between the upper member and the lower member. The central member includes a central member aperture configured for a steering shaft to extend therethrough.

Abstract: A radar sensor system implemented using a radar sensor housing and a module electronic device configured to present situational awareness indicators associated with targets determined to be located in proximity to a bicycle. The mobile electronic device includes a position-determining component for determining a current geographic position of the bicycle, a wireless transceiver for receiving radar sensor data from a radar sensor in the radar sensor housing, a display, and a processor coupled with the position-determining component, the wireless transceiver, and the display. The processor is configured to determine one or more situational awareness indicators based on the received radar sensor data and cause the display to present location information and the one or more situational awareness indicators.

Abstract: An upper half body flange is disposed over a whole circumference of a lower end portion of an upper half body along a plane and a lower half body flange is disposed over a whole circumference of an upper end portion of a lower half body along the plane. The upper half body and the lower half body are made of titanium material, and the upper half body flange and the lower half body flange have linear outer edges as straight line portions. The upper half body has a side surface, the lower half body has a side surface, and the side surface and the side surface include recesses and convex portions. The recesses and the convex portions are disposed within a range of lengths of the straight line portions when viewed from above in the direction perpendicular to the plane.

Abstract: A motorcycle having rear-steering controls, including a rear handle bar for steering, for allowing a rear rider to control the motorcycle from a rearward position.

Abstract: An air-guiding device for a motorcycle is provided to provide defined guidance of wind airflow in a region of a motorcycle fork. The air-guiding device include at least one rear guiding element in the longitudinal direction configured to be rigidly fastened to the motorcycle behind the motorcycle fork, and a front guiding element configured to be fastened indirectly or directly to the rear guiding element in front of the motorcycle fork in a manner which allows the front guiding element to rotate relative to the rear guiding element when the motorcycle fork is rotated about a vertical axis. The air guiding device may also be provided with a central guiding element behind the motorcycle for which is connected to the front guiding element and rotatable relative to the rear guiding element.

Abstract: A motorcycle (1) having front and rear ground-engaging wheels, the motorcycle (1) comprising a swing arm (5) supporting the rear wheel (3), a rear suspension unit (RSU) (12), a drop link (14) pivotally connected to the RSU (12) and pivotally connected to the swing arm (5), and a drag link (16) pivotally connected to the drop link (14). The drop link (14) extends between the RSU (12) and the drag link (16) for increasing a travel distance of the RSU (12) relative to a travel distance of the swing arm (5). The RSU (12) is mounted underneath a seat (42).

Abstract: A device for accommodating a muffler for a two-wheel vehicle, in particular a motorcycle, includes a holder part that can be fastened to a structural component of the two-wheel vehicle. The holder part retains the muffler. A plastic part is used as the holder part.

Abstract: A saddle-riding-type vehicle cable support structure is a cable support structure configured to support a first cable and a second cable that are joined to a side part of a wheel, the cable support structure including: a joint section provided on a middle of the first cable and which is fixed to a vehicle body; and a second cable support member attached to the joint section and which supports the second cable.

Abstract: A motorcycle includes a head pipe, a main frame that extends rearwardly and downwardly from the head pipe, and a V-type engine supported by the main frame. Further, the motorcycle includes a rear frame that is supported by the main frame and extends rearwardly from the main frame, a seat arranged upwardly of the rear frame and supported by the rear frame and a tank forming member attached to part of the rear frame via a gasket. The rear frame and the tank forming member are formed by casting. Part of the rear frame, the gasket and the tank forming member integrally form an oil tank. The oil tank is located at a position farther downward than the seat.

Abstract: A vehicle includes a vehicle body, a front wheel that is disposed anterior to the vehicle body and that is steerable about a steering axis, and a front fork that supports the front wheel. The vehicle body includes a vehicle body frame and a steering rotation unit that is supported on the vehicle body frame and that rotates about the steering axis. The vehicle includes a variable trail length mechanism. The variable trail length mechanism includes an oscillation shaft that extends in a vehicle width direction to thereby connect the front fork oscillatably with the steering rotation unit. The oscillation shaft is disposed at a position overlapping an axis of the front fork in a vehicle side elevational view.

Abstract: A motorcycle transmission includes a swingarm which extends from one hinging end to a motorcycle chassis, defining an oscillation axis, at one connection end to a wheel, a homokinetic joint arranged on the side of the hinging end, and a geared coupling positioned on the side of the connection end. The homokinetic joint kinematically reciprocally connects a first end of an input shaft, connected to a power take-off, and a second end of an output shaft mechanically connected to the geared coupling. The geared coupling transmits motion to the wheel. The homokinetic joint performs an instantaneously constant transmission ratio between the first and the second end. The homokinetic joint is offset to the hinging end of the swingarm, in a vertical direction perpendicular to the support surface of the wheel and permits oscillation of the output shaft between a stroke start and a stroke end, parallel to the oscillation axis.

Abstract: A bicycle radar system including a camera is disclosed. The system may include a radar unit and a bicycle computing device that are in communication with one another. The radar unit may transmit radar signals, receive return signals (reflections), and process the returned radar signals to determine a location and velocity of one or more targets located in a sensor field behind a user's bicycle. The radar unit may also include an integrated camera to selectively provide images or video of an area behind the bicycle in the camera's field of view. The radar unit may analyze the returned radar signals and images and/or video to track the location of targets located behind the bicycle. The bicycle computing device or the radar unit may also selectively activate the camera based upon the satisfaction of particular conditions.

Abstract: In the electric component support structure for the saddle ride vehicle including a body frame F that supports a water-cooled engine, and a radiator that is supported on the body frame through collars, a gyro sensor is fixed to electric component support pieces provided on the radiator.

Abstract: An air-cleaner structure of a saddle-ride vehicle is provided with an air-cleaner case arranged between a seat and a head pipe located in front of the seat. The air-cleaner case is provided with a bottom half and a top half. The bottom half is arranged in a space surrounded by a rear face of the head pipe and a pair of left and right main frames extending from the head pipe toward the rear of the vehicle. The top half is situated above the main frames. The top half is provided in a vertical two division structure. A dividing surface of the vertical two division structure of the top half is inclined in the vehicle-longitudinal direction. An air-cleaner element is mounted along the inclined dividing surface.

Abstract: A variable-trim frame for two-wheeled vehicles has a fork able to connect a handlebar to a hub of a front wheel of the vehicle. A regulating element is provided to rotatably couple the lower portion of the shaft of the handlebar with respective portions of the blades of the fork and destined to make the fork assume a predetermined position in which it is inclined by a relative angle with respect to a perpendicular plane to the ground. A blocking device stabilizes the fork in the predetermined position.

Abstract: A stand support structure of a saddle riding vehicle has a main frame, a pivot block configured to swingably support a rear wheel-supporting swing arm, and a stand-supporting bracket. The pivot block has a first plate and a second plate attached to the main frame. The first plate and the second plate are coupled to each other. The first plate has a protrusion protruding outward farther than an extension end of the second plate. The stand-supporting bracket is coupled to a surface of the protrusion facing in a vehicle width direction.

Abstract: Provided is a motorcycle including a frame, a front ground-engaging wheel, rear ground-engaging wheel and a steering assembly. The steering assembly includes handlebars, an upper steering stem, a lower steering stem and a lever assembly intermediate the upper steering stem and the lower steering stem and wherein the steering assembly is operably connected to the front ground-engaging wheel.

Abstract: A fender for a motor vehicle has at least a first fender section and a second fender section. The second fender section is rotatably connected to the first fender section so as to be able to rotate at least between an operational position and an open position. The rotatable connection between the second fender section and the first fender section is provided by two pin-shaped connecting elements.

Abstract: A vehicle height adjustment apparatus includes a control device. The control device controls the opening degree of the solenoid valve to allow a movement amount of the support member to reach a movement amount target value that corresponds to the vehicle height set in advance, in accordance with the weight applied to the vehicle. The control device controls the opening degree of the solenoid valve to change the movement amount of the support member based on a difference between a value based on the information related to the vehicle height and a vehicle height-related target value, on condition that the movement amount of the support member reaches the movement amount target value and the value based on the information related to the vehicle height obtained by the information obtaining device does not reach the vehicle height-related target value that corresponds to the vehicle height set in advance.

Abstract: A bank angle detection device for a motorcycle includes a bank angle estimator configured to estimate a moving body bank angle ?b and a correcting section configured to estimate a vehicle body bank angle ?f. The bank angle estimator estimates the moving body bank angle ?b that is a gradient of a moving body axial line A1, on the basis of a balance state where a centrifugal force CF acting on a moving body and a gravitational force GF acting on the moving body during cornering are in balance with each other. The correcting section corrects the moving body bank angle ?b on the basis of an inertia force about a longitudinal axis acting on a vehicle body, so as to estimate the vehicle body bank angle ?f that is a gradient of a center of gravity G of the vehicle body with respect to a vertical line.

Abstract: A flow path control device according to one embodiment includes a first valve which transitions between a closed state where a first flow is closed and an open state where the first flow path is open by moving toward an space from the closed state. The first valve is formed with an axial through-hole that communicates with the first flow path and the space. A pressure-receiving area of the first valve against a jack chamber is smaller than that against the space. Further, a second valve is provided in the space on a second flow path so as to transition between a first state where the axial through-hole is closed and an inflow path oriented toward the space from the jack chamber is open and a second state where it is closed and the axial through-hole is open.

Abstract: A retractable powered bipod motorcycle stand, attaching below a frame of a motorcycle, retracts and extends below the motorcycle to maintain the motorcycle in a upright position, the motorcycle stand being remotely controlled under power to retract and extend from a travel position to a parked position and back, the retractable motorcycle stand providing an upper mounting frame assembly attached below the motorcycle frame, a bipod lower leg assembly rotating between an elevated position and an extended position, a shaft providing a pivotal relationship between the upper mounting frame assembly and the lower leg assembly, a pusher assembly driving a drive gear attached to the shaft to provide forced rotation of the lower leg assembly, the pusher assembly attaching to a remote activated actuator to provide linear movement to the pusher assembly to drive the pusher assembly in a forward and reverse position to raise and lower the lower leg assembly under intentional force by a remote activation means.

Abstract: A seat attachment structure of a saddle riding vehicle in which, in a state a first end side of a seat, on which an occupant sits, in a forward/rearward direction of a vehicle body is locked to the vehicle body, a second end side of the seat in the forward/rearward direction of the vehicle body is coupled to the vehicle body, the seat attachment structure of the saddle riding vehicle includes a seat attachment member configured to couple a second end side of a seat to a vehicle body, and the seat attachment member includes vehicle body-side connecting sections swingably attached to the vehicle body while having an axis extending along a vehicle width direction as a swing axis, and seat fixing sections to which the second end side of the seat is attached.

Abstract: A snowmobile frame includes a tunnel, an engine cradle, a front suspension, a forward support and a fuel tank having a lower and an upper wall connected together 5 to enclose a volume. The volume fluidly communicates with the engine and has a portion extending upwardly and forwardly from the tunnel to the forward support. The fuel tank is removably connected to the tunnel and the forward support by the upper wall which has a left and a right lower end portion respectively connected to the tunnel on a left and right side of the longitudinal centerplane, and an upper end 10 portion connected to the forward support. The lower wall is connected to the upper wall above lower end portions and below the upper end portion. A force transmitted between the forward support and the tunnel, via the fuel tank, is transmitted through the upper wall without passing through the lower wall.

Abstract: A swing arm structure includes pivot shafts extending in a vehicle width direction and disposed in a vehicle body frame, a pair of wall portions disposed in the vehicle width direction in the vehicle body frame, and an interposed portion disposed between the wall portions in a swing arm. The wall portions have wall portion-side pass-through portions, which receive the pivot shafts passed therethrough. The interposed portion has interposed portion-side pass-through portions formed therein at, out of both end portions in the vehicle width direction, portions facing the wall portion-side pass-through portions. The interposed portion-side pass-through portions receive the pivot shafts passed therethrough. The interposed portion has a non-pass-through portion formed therein at a middle portion in the vehicle width direction of the interposed portion. The non-pass-through portion does not receive the pivot shafts.

Abstract: A vehicle driving force control device controls a driving force of an engine in accordance with an operation of a handlebar grip attached to a motorcycle. The handlebar grip is nonrotatably secured to a handlebar of the motorcycle. The vehicle driving force control device includes a strain gauge and a control section. The strain gauge acts as twisting force detection means for detecting a twisting force that is oriented in a normal rotation direction or in a reverse rotation direction and applied to the handlebar grip. The control section controls the driving force in accordance with the detected twisting force. The control section exercises control to increase the driving force in accordance with the twisting force oriented in the normal rotation direction.

Abstract: Provided is a saddled-vehicle cowl structure capable of effectively supplying outside air to a power unit. A saddled-vehicle cowl structure includes a main seat on which an occupant is seated, a side cowl that covers a side lower part of the main seat, an air cleaner box provided below the main seat and connected to a power unit, and an air intake duct for supplying outdoor air to the air cleaner box. The side cowl includes an inner side cowl and an outer side cowl disposed on a vehicle width direction outer side of the inner side cowl. An air intake port for supplying traveling wind to the air intake duct is provided near a front end portion of the inner side cowl. The air intake port is covered by the outer side cowl from an outer side.

Abstract: The present disclosure provides a conveyance seat that can discharge liquid splashed on a cover member of the seat so that clothing does not get wet with the liquid remaining on the cover member. A conveyance seat includes a bottom plate and a cover member attached to the bottom plate. A discharge hole for discharging the liquid splashed on the cover member is formed in the bottom plate. The cover member includes: a slit by which the surface is divided; and welded portions where portions of the cover member divided by the slit are welded together. The welded portions are inclined toward the discharge hole to form discharge lines which guide discharge of the liquid splashed on the cover member.

Abstract: Provided is a motorcycle incorporating a supercharger which can prevent an increase in a size of a vehicle body. A motorcycle comprises a supercharger which compresses intake air; an air-intake chamber which is placed downstream of the supercharger, stores the intake air compressed in the supercharger, and guides the intake air from the air-intake chamber to a combustion chamber of an engine; a fuel tank placed above the engine, wherein the air-intake chamber is placed between the fuel tank and the engine, and wherein the fuel tank includes a recess-forming section provided with a recess on a bottom surface of the fuel tank in such a manner that the bottom surface of the fuel tank does not interfere with the air-intake chamber.