A snowmobile includes a seat having a rear end with a rear end face. The rear end face is inclined upwardly and rearwardly from an upper surface of a tunnel of a frame so that a cavity is defined beneath the seat between the inclined rear end face of the seat and the upper surface of the tunnel.
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What is claimed is: 1. A snowmobile comprising: a frame including a tunnel having an upper surface; an engine located on the frame, the engine including a cylinder block defining a cylinder bore having a cylinder bore axis, the cylinder block defining an exhaust port communicating with the cylinder
What is claimed is: 1. A snowmobile comprising: a frame including a tunnel having an upper surface; an engine located on the frame, the engine including a cylinder block defining a cylinder bore having a cylinder bore axis, the cylinder block defining an exhaust port communicating with the cylinder bore, the cylinder block defining an inlet port communicating with the cylinder bore, the inlet port and the exhaust port being disposed on the same side of the engine; a drive track disposed below and supported by the tunnel and operatively connected to the engine for propulsion of the snowmobile; first and second skis mounted to the frame by first and second front suspensions, respectively; a seat disposed on the tunnel above the drive track and rearward of the engine, the seat having a rear end with a rear end face, the rear end face being inclined upwardly and rearwardly with respect to the upper surface of the tunnel so that a cavity is defined beneath the seat between the inclined rear end face and the upper surface of the tunnel; and a steering device coupled to the frame forward of the seat and operatively connected to the first and second skis for steering the snowmobile. 2. The snowmobile of claim 1, wherein the cavity is exposed during operation of the snowmobile. 3. The snowmobile of claim 1, wherein a portion of the upper surface of the tunnel extends rearwardly beyond the rear end of the seat. 4. The snowmobile of claim 1, further comprising first and second running boards coupled to opposite sides of the tunnel. 5. The snowmobile of claim 1, wherein the inlet port and the exhaust port are disposed on a front side of the engine. 6. The snowmobile of claim 1, further comprising a heat shield disposed between the inlet port and the exhaust port, the heat shield extending between a throttle body communicating with the inlet port and an exhaust pipe communicating with the exhaust port. 7. The snowmobile of claim 1, wherein the upper surface of the tunnel is a generally planar surface which extends generally horizontally beneath the seat, and wherein the tunnel also includes first and second generally vertically extending sidewalls extending downwardly from the upper surface. 8. A snowmobile comprising: a frame including a tunnel having an upper surface; a drive track supported by the frame and disposed below and the tunnel; a drive comprising an engine connected to the frame and a drivetrain operatively coupling the engine to the drive track for propulsion of the snowmobile, the engine including a cylinder block defining a cylinder bore having a cylinder bore axis, the cylinder block defining an exhaust port communicating with the cylinder bore, the cylinder block defining an inlet port communicating with the cylinder bore, the inlet port and the exhaust port being disposed on the same side of the engine; and a seat disposed on the tunnel above the drive track and rearward of the engine, the seat having a rear end with a rear end face, the rear end face being inclined upwardly and rearwardly from the upper surface of the tunnel so that a cavity is defined beneath the seat between the inclined rear end face of the seat and the upper surface of the tunnel. 9. The snowmobile of claim 8, wherein an outer extent of the drive is disposed at a first radius from a drive center axis extending laterally through the snowmobile, a first control point of the snowmobile is disposed at a second radius from the drive center axis, and the second radius is greater than the first radius. 10. The snowmobile of claim 9, further comprising a steering device including a handlebar having a rotational axis, a first grip axis and a second grip axis, and wherein the first control point is defined by an intersection of the rotational axis and a grip plane defined by the first grip axis and the second grip axis. 11. The snowmobile of claim 8, further comprising first and second skis mounted to the frame by first and second front suspensions, respectively, and a steering device coupled to the frame forward of the seat and operatively connected to the two first and second for steering the snowmobile. 12. The apparatus of claim 11, wherein the first and second front suspensions each include a plurality of suspension arms coupled between the frame and a spindle, the first and second front suspensions also including a shock absorber and spring. 13. The snowmobile of claim 8, wherein the rear end face of the seat forms an acute angle with the upper surface of the tunnel. 14. The snowmobile of claim 8, further comprising a hood coupled to the frame above the engine, the hood defining an air plenum which provides air to a throttle body of the engine. 15. The snowmobile of claim 8, wherein the drive-train includes a drive sprocket coupled to a drive shaft rotatable about a drive axis, the drive sprocket being configured to mate with the drive track to cause movement of the drive track upon rotation of the drive sprocket by the drive shaft. 16. The snowmobile of claim 8, wherein the cavity is exposed during operation of the snowmobile. 17. The snowmobile of claim 8, wherein a portion of the upper surface of the tunnel extends rearwardly beyond the rear end of the seat. 18. The snowmobile of claim 8, wherein the upper surface of the tunnel is a generally planar surface which extends generally horizontally beneath the seat, and wherein the tunnel also includes first and second generally vertically extending side walls extending downwardly from the upper surface. 19. The snowmobile of claim 18, further comprising first and second running boards coupled to the first and second side walls of the tunnel, respectively.
Kurosu Shinichi (Ageo JPX) Chonan Mitsugi (Koga JPX) Tachibana Fusao (Shiraoka JPX) Suzuki Kazuo (Ageo JPX) Yuzuriha Yoshiki (Isezaki JPX), Protecting device for an electronic control unit of a snowmobile.
David Charles Thompson ; Rhonda Lynnette Martinsen ; Jack Thomas Nelson, Seating system configurable between one-person to two-person configurations, and methods for configuring the same.
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