Abstract: A suspension device for providing a resilient support for a snowmobile body includes a frame for supporting the snowmobile body. A slide rail is operatively connected to the frame for pressing a crawler belt against a snow surface. A swing arm includes a first end pivotally supported on the frame and a second end pivotally mounted on the slide rail. A shock absorber includes a first end pivotally supported on a shaft adjacent to the first end of the swing arm, and a second end of the shock absorber being connected to the frame through a progressive link pivotally supported on the swing arm.

Abstract: A pair of upright portions are provided on the opposite side portions of a floor on which a driver of a small snowmobile stands. A pad extends inwardly from an upper portion of each of the upright portions to securely hold the feet of the driver while maintaining adequate floor surface area for the feet. Further, a radiator for cooling an engine is disposed along a lower face of the floor so that it melts snow lying on the floor.

Abstract: A chain of a driving device for a snowmobile can be adjusted by a simple operation. A gear case is provided with lever portions. One lever portion is mounted on a gear case pivot. The other lever portion is fastened with a bracket provided on an upper frame through a chain adjuster. The chain adjuster has a cam surface and has a rotational shaft held in a slit of the bracket. The chain adjuster is loosened and rotated through a predetermined angle. Then, the gear case rotates around the gear case pivot and the idle shaft moves whereby stretching of the chain can be finely adjusted.