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A snowmobile comprises a frame assembly. An internal combustion engine is mounted to the frame assembly. A steering assembly is mounted to the frame assembly. The steering assembly comprises a steering shaft having a first portion and a second portion. The first portion of the steering shaft is coup

A snowmobile comprises a frame assembly. An internal combustion engine is mounted to the frame assembly. A steering assembly is mounted to the frame assembly. The steering assembly comprises a steering shaft having a first portion and a second portion. The first portion of the steering shaft is coupled to a steering input mechanism. The second portion of the steering shaft is coupled to a power steering device. The power steering device is coupled to a steering linkage. The steering linkage is coupled to a steering ski.

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What is claimed is: 1. A snowmobile comprising a frame assembly, an internal combustion engine mounted to the frame assembly, and a steering assembly mounted to the frame assembly, the steering assembly comprising a steering shall having a first portion and a second portion, the first portion of th

What is claimed is: 1. A snowmobile comprising a frame assembly, an internal combustion engine mounted to the frame assembly, and a steering assembly mounted to the frame assembly, the steering assembly comprising a steering shall having a first portion and a second portion, the first portion of the steering shaft being coupled to a steering input mechanism, the second portion of the steering shaft being coupled to a power steering device, the power steenng device being coupled to a steering linkage, and the steering linkage being coupled to at least one steering ski, the power steering device being positioned generally about a longitudinally and vertically extending center plane of the snowmobile. 2. The snowmobile of claim 1, further comprising another steering ski coupled with the at least one steering ski through the steering linkage. 3. The snowmobile of claim 1, wherein the power steering device comprises an input shaft, and the input shaft is coupled directly to the steering shaft. 4. The snowmobile of claim 1, wherein the internal combustion engine is positioned generally in front of and generally below, the power steering device. 5. The snowmobile of claim 1, wherein a height of the power steering device relative to a surface supporting the first steering ski is greater than a height of the internal combustion engine relative to a surface supporting the first steering ski. 6. The snowmobile of claim 1, wherein a portion of the power steering device is located a first distance from a portion of the first steering ski, a portion of the internal combustion engine is located a second distance from the portion of the first steering ski, and The first distance is greater than the second distance. 7. The snowmobile of claim 1, wherein a center of mass of the power steering device is positioned higher than a center of mass of the internal combustion engine relative to a surface supporting the first steering ski. 8. The snowmobile of claim 1, wherein a center of mass of the power steering device is positioned closer to a rear portion of the snowmobile than a center of mass of the internal combustion engine is positioned. 9. The snowmobile of claim 1, wherein the steering shaft is positioned generally about a longitudinally and vertically extending center plane of the snowmobile. 10. The snowmobile of claim 1, wherein the power steering device comprises an electric motor, and the electric motor is positioned generally about a longitudinally and vertically extending center plane of the snowmobile. 11. The snowmobile of claim 1, wherein the power steering device comprises an electric motor, and at least a portion of the electric motor is disposed generally forward of the steering shaft. 12. The snowmobile of claim 1, wherein the internal combustion engine is positioned generally closer to a front portion of the snowmobile than is the steering shaft. 13. The snowmobile of claim 1, wherein the internal combustion engine comprises a cylinder having an inclined cylinder axis that extends generally upward and generally toward a rear portion of the snowmobile. 14. The snowmobile of claim 1, wherein the power steering device comprises an electric motor, and at least a portion of the electric motor is disposed generally above the internal combustion engine. 15. The snowmobile of claim 1, wherein the internal combustion engine comprises a cylinder having an inclined cylinder axis that extends generally upward and generally toward a rear portion of the snowmobile, and wherein the power steering device comprises an electric motor, and at least a portion of the electric motor is disposed generally above the internal combustion engine, to concentrate mass near a center of gravity of the snowmobile. 16. The snowmobile of claim 1, wherein the steering shaft has a steering axis, the internal combustion engine comprises a cylinder having a cylinder axis, and the power steering device comprises an electric motor having a motor axis, wherein the steering axis lies within a first plane, the cylinder axis lies within a second plane generally parallel to the first plane, and the motor axis lies within a third plane generally normal to the first and second planes. 17. A snowmobile comprising a frame assembly, an internal combustion engine mounted to the frame assembly, and a steering assembly mounted to the frame assembly, the steering assembly comprising a steering shaft having a first portion and a second portions the first portion of the steering shaft being coupled to a steering input mechanism, the second portion of the steering shaft being directly coupled to an input shaft of a power steering device, an output shaft of the power steering device being coupled to a steering linkage, and the steering linkage being coupled to at least one steering ski, the power steering device being positioned generally about a longitudinally and vertically extending center plane of the snowmobile. 18. A snowmobile comprising a frame assembly, an internal combustion engine mounted to die frame assembly, and a steering assembly mounted to the frame assembly, the steering assembly comprising a steering shaft having a first portion and a second portion, the first portion of the steering shaft being coupled to a steering input mechanism, the second portion of the steering shaft being coupled to a power steering device, the power steering device being coupled to a steering linkage, and the steering linkage being coupled to at least one steering ski, the internal combustion engine being positioned generally in front of, and generally below, the power steering device. 19. A snowmobile comprising a frame assembly, an internal combustion engine mounted to the frame assembly, and a steering assembly mounted to the frame assembly, the steering assembly comprising a steering shaft having a first portion, a second portion and a steering axis, the first portion of the steering shaft being coupled to a steering input mechanism, the second portion of the steering shaft being coupled to a power steering device, the power steering device comprising an electric motor having a motor axis, the motor axis being oriented generally normal to the steering axis, the power steering device being coupled to a steering linkage, and the steering linkage being coupled to at least one steering ski. 20. The snowmobile of claim 19, wherein the internal combustion engine comprises a cylinder having a cylinder axis, and wherein the steering axis lies within a first plane and the cylinder axis lies within a second plane generally parallel to the first plane. 21. The snowmobile of claim 20, wherein the motor axis lies within a third plane generally normal to the first and second planes. 22. A snowmobile, comprising a frame assembly, an internal combustion engine mounted to the frame assembly, a transmission system coupled to the engine, a drive track system disposed below a seat portion, the drive track system coupled to the frame assembly and coupled to the transmission system, the drive tack system comprising a drive track belt and a drive track suspension system, and a steering assembly mounted to the frame assembly, the steering assembly comprising a steering shaft having a first portion and a second portion, the first portion of the steering shalt being coupled to a steering input mechanism, the second portion of the steering shaft being coupled to a power steering device, the power steering device being coupled to a steering linkage, and the steering linkage being coupled to at least a pair of steering skis, the power steering device being positioned generally about a longitudinally and vertically extending center plane of the snowmobile. 23. The snowmobile of claim 18, wherein a height of the power steering device relative to a surface supporting the first steering ski is greater than a height of the internal combustion engine relative to a surface supporting the first steering ski. 24. The snowmobile of claim 18, wherein a portion of the power steering device is located a first distance from a portion of the first steering ski, a portion of the internal combustion engine is located a second distance from the portion of the first steering ski, and the first distance is greater than the second distance. 25. The snowmobile of claim 18, wherein a center of mass of the power steering device is positioned higher than a center of mass of the internal combustion engine relative to a surface supporting the first steering ski. 26. The snowmobile of claim 18, wherein a center of mass of the power steering device is positioned closer to a rear portion of the snowmobile than a center of mass of the internal combustion engine is positioned. 27. The snowmobile of claim 18, wherein the steering shaft is positioned generally about a longitudinally and vertically extending center plane of the snowmobile. 28. The snowmobile of claim 18, wherein the internal combustion engine is positioned generally closer to a front portion of the snowmobile than is the steering shaft. 29. The snowmobile of claim 18, wherein the internal combustion engine comprises a cylinder having an inclined cylinder axis that extends generally upward and generally toward a rear portion of the snowmobile.