Abstract: A torque-responsive clutch has an output shaft and an output pulley mounted with respect to the shaft. The output pulley includes a first sheave fixed with respect to the shaft and a second sheave axially movable with respect to the shaft. A helix is mounted with respect to the shaft. In the improvement, a roller container is mounted for driven engagement with the shaft and such container has an interior surface with a plurality of helix-contacting devices, e.g., rollers, mounted adjacent thereto. The helix extends into the container and contacts the devices. In other aspects of the improved clutch, the roller container and the second sheave define a chamber and the helix-contacting devices are confined in such chamber.

Abstract: A traction lug to be mounted on a snowmobile track-band, and being so positioned transversely under the track-supporting rails that the forces imposed thereon during travel will be directed symmetrically with respect to the rails so as to avoid distortion of the track-band and provide positive support therefor.

Abstract: Disclosed herein is a variable transmission drive pulley assembly comprising a fixed sheave connected to a drive shaft for common rotation therewith, a movable sheave carried by the drive shaft for movement axially thereof relative to a retracted position spaced from the fixed sheave, a spring urging the movable sheave toward the retracted position in the direction away from the fixed sheave, speed responsive fly weights for displacing the movable sheave toward the fixed sheave, a second spring for augmenting the effectiveness of the speed responsive fly weights and a selectively operable control including a ratchet mechanism for regulating operation of the second spring independently of the rate of drive shaft rotations.

Abstract: Disclosed herein is a snowmobile comprising a drive sprocket mounted on a chassis, a track suspension assembly, a track trained around said sprocket and said track suspension assembly, a rear arm floatably connecting the chassis to the track suspension assembly, a front suspension link pivotally connected to the chassis about an axis fixed with respect to the chassis, a plurality of vertically spaced mounting apertures on the track suspension assembly, and a member selectively pivotally connecting the front link to one of the mounting apertures.

Abstract: Disclosed herein is a variable transmission drive pulley assembly comprising a fixed sheave connected to a drive shaft for common rotation therewith, a movable sheave carried by the drive shaft for movement axially thereof relative to a retracted position spaced from the fixed sheave, a spring urging the movable sheave toward the retracted position in the direction away from the fixed sheave, speed responsive means for displacing the movable sheave toward the fixed sheave, means for modifying the effectiveness of the speed responsive means, and selectively operable control means for controlling operation of the speed responsive means and the means for modifying the effectiveness of said speed responsive means.