Abstract: A clutch weight for a continuously variable transmission is disclosed. The clutch weight, in certain examples, includes a body having a first end having a pivot pin opening and a second end opposite the first end, a curvilinear surface disposed between the first end and the second end configured to engage a roller, and wherein the roller contacts the curvilinear surface at least at a first contact position, and a center of mass of the body disposed a distance Y from a center of the pivot pin opening and a distance X from the first contact position, and where a ratio of X to Y is in the range of between about 0.499 and 0.685.

Abstract: A clutch weight for a continuously variable transmission is disclosed. The clutch weight, in certain examples, includes a body having a first end having a pivot pin opening and a second end opposite the first end, a curvilinear surface disposed between the first end and the second end configured to engage a roller, and wherein the roller contacts the curvilinear surface at least at a first contact position, and a center of mass of the body disposed a distance Y from a center of the pivot pin opening and a distance X from the first contact position, and where a ratio of X to Y is in the range of between about 0.526 and 0.558.

Abstract: An exhaust system is provided for a snowmobile having a front portion in which an engine is mounted, a rearward portion, and a track belt for propelling the snowmobile. The track belt is in a track belt tunnel that extends from behind the engine to a rear portion of the snowmobile. The exhaust system includes an exhaust pipe that extends from an exhaust outlet of the engine to the track belt tunnel. At least one exhaust outlet is located within the track belt tunnel at a position within the inner circumference of the track belt.

Abstract: An exhaust system is provided for a snowmobile having a front portion in which an engine is mounted, a rearward portion, and a track belt for propelling the snowmobile. The track belt is in a track belt tunnel that extends from behind the engine to a rear portion of the snowmobile. The exhaust system includes an exhaust pipe that extends from an exhaust outlet of the engine to the track belt tunnel. At least one exhaust outlet is located within the track belt tunnel at a position within the inner circumference of the track belt.

Abstract: An auxiliary electronic fuel injection control apparatus for enhancing engine performance includes an isolation circuit connectable to a main control switch having an output voltage pulse and a ground. A pass-through switch is in electrical communication with the isolation circuit and is connectable to a fuel injector, the isolation circuit designed to substantially render the pass-through switch transparent to the main control switch. A re-driver switch is in electrical communication with the pass-through switch and is connectable to the fuel injector and the ground. An auxiliary controller is in electrical communication with the isolation circuit, the pass-through switch, the re-driver switch, and to the ground. The output voltage pulse triggers the auxiliary controller to turn the pass-through switch and the re-driver switch on and off to effectively alter a duration of current to the fuel injector.