A snowmobile has a frame including a tunnel having a passage therethrough, at least one ski, an engine having an engine air inlet and an engine exhaust outlet, and a drive track operatively connected thereto and disposed at least partly below the tunnel around a rear suspension. A heat exchanger connected to the tunnel has heat exchanger engine air inlet and outlet, a cooling air inlet and a cooling air outlet fluidly connected between the cooling air inlet and the passage. A snowmobile has a pipe fluidly connected to the exhaust outlet and having first and second pipe outlets. The snowmobile further has a muffler having first and second muffler inlets and a muffler outlet, a turbocharger, first and second exhaust flow passages, and a valve disposed between the pipe and the first muffler inlet for selectively controlling the flow of exhaust gas flowing through the first exhaust flow path.

A snowmobile has a frame including a tunnel having a passage therethrough, at least one ski, an engine having an engine air inlet and an engine exhaust outlet, and a drive track operatively connected thereto and disposed at least partly below the tunnel around a rear suspension. A heat exchanger connected to the tunnel has heat exchanger engine air inlet and outlet, a cooling air inlet and a cooling air outlet fluidly connected between the cooling air inlet and the passage. A snowmobile has a pipe fluidly connected to the exhaust outlet and having first and second pipe outlets. The snowmobile further has a muffler having first and second muffler inlets and a muffler outlet, a turbocharger, first and second exhaust flow passages, and a valve disposed between the pipe and the first muffler inlet for selectively controlling the flow of exhaust gas flowing through the first exhaust flow path.

A long-travel continuously-rising-rate track carriage and suspension mechanism for motive drive and cushioned support of a tracked land vehicle upon a ground-contacting lower run of an endless-loop track. A present practical application of the invention is to convert a motorcycle into a snowbike for over-snow use wherein the rear wheel and swingarm of the motorcycle are replaced by the track carriage and suspension mechanism of the present invention and the front wheel is replaced by one or more skis. The unique long-travel rising-rate track suspension is accomplished employing a single swingarm connected pivotally between the vehicle chassis and a track skid, and using a bell crank and connecting rod to provide progressive actuation of a shock absorber upon compression of the track suspension. The track is carried and driven by components mounted to the single swingarm.

The invention provides a vehicle drivable in use by a person walking or running while seated comprising: a frame; a large diameter front wheel non-steerable with respect to the frame, a seat for supporting a user's weight while walking or running, the frame configured to carry the seat suspended on the front wheel, a small diameter, steerable rear wheel journalled to the frame at a steering pivot axis, the seat being rotatable forwardly with respect to the front wheel and comprising a seat base for supporting a user and further comprising a backrest for engaging the user's back in use. The large front wheel may be of approximate diameter of a user's leg (typically an adult human), thus the large front wheel may be of similar size to a bicycle wheel for the user.

The invention provides a vehicle drivable in use by a person walking or running while seated comprising: a frame; a large diameter front wheel non-steerable with respect to the frame, a seat for supporting a user's weight while walking or running, the frame configured to carry the seat suspended on the front wheel, a small diameter, steerable rear wheel journalled to the frame at a steering pivot axis, the seat being rotatable forwardly with respect to the front wheel and comprising a seat base for supporting a user and further comprising a backrest for engaging the user's back in use. The large front wheel may be of approximate diameter of a user's leg (typically an adult human), thus the large front wheel may be of similar size to a bicycle wheel for the user.

This device is a reverse mechanism for a motorcycle with a sidecar. It is related to a motorcycle conversion assembly whereby the sidecar is outfitted with a mechanism to allow the motorcycle and sidecar combination apparatus to move in a rearward direction. The device is comprised of a retractable wheel, a drive system, a control mechanism, a battery power source and a structure to removably connect the drive and wheel to both the motorcycle and sidecar.

This device is a reverse mechanism for a motorcycle with a sidecar. It is related to a motorcycle conversion assembly whereby the sidecar is outfitted with a mechanism to allow the motorcycle and sidecar combination apparatus to move in a rearward direction. The device is comprised of a retractable wheel, a drive system, a control mechanism, a battery power source and a structure to removably connect the drive and wheel to both the motorcycle and sidecar.

The system can include a vehicle having a vehicle frame and a traction apparatus connected to the vehicle frame for providing traction on a planar surface to move the vehicle relative to the planar surface, the vehicle frame having a seat for supporting a user. The system can also include a support structure including a plurality of runners for contacting the planar surface, the plurality of runners including one or more of the following: skates and skis, and a weight compensation system connecting the vehicle frame to the support structure about a pivot. The weight compensation system is configured to adjust the position of the traction apparatus relative to the support structure in response to weight of a user.

The system can include a vehicle having a vehicle frame and a traction apparatus connected to the vehicle frame for providing traction on a planar surface to move the vehicle relative to the planar surface, the vehicle frame having a seat for supporting a user. The system can also include a support structure including a plurality of runners for contacting the planar surface, the plurality of runners including one or more of the following: skates and skis, and a weight compensation system connecting the vehicle frame to the support structure about a pivot. The weight compensation system is configured to adjust the position of the traction apparatus relative to the support structure in response to weight of a user.

An ice scratcher for attachment to a snowmobile includes first and second ice scratcher end portions opposite to each other, an elongate member connected to the second ice scratcher end portion, and a spring connecting the first ice scratcher end portion to the elongate member. The spring has a plurality of coils defining a coil radius. The spring is movable between an unbent configuration, wherein a centerline passing through respective centers of each coil of the plurality of coils defines a coil axis, and a bent configuration, wherein at least a portion of the centerline is displaced from the coil axis. At least a portion of the first ice scratcher end portion is radially spaced from the coil axis by a distance less than the coil radius and adapted for attachment to the snowmobile. Ice scratcher assemblies, kits and snowmobiles having the ice scratcher are also disclosed.