Abstract: A shift collar for a transmission is disclosed. The shift collar includes a gear engagement surface for engaging a transmission gear, at least seven engagement dogs projecting from the gear engagement surface, a shift sleeve engagement surface for engaging a shift sleeve, and a plurality of grooves formed in the shift sleeve engagement surface for engaging corresponding splines on the shift sleeve. Preferably the engagement dogs are arranged on the gear engagement surface such that each of the engagement dogs engage one of a corresponding number of engagement pockets in the transmission gear.

Abstract: A motorcycle transmission (100) utilizes a shift fork (45), a shift collar (30) including a plurality of engagement teeth (30c) and a collar rib (30a) and a gear (34) (or one of the other six gears). The engagement teeth (30c) drive the teeth (34a) of the gear (34). A trap door (49), in combination with a threaded retainer (55), reduces axial play in shafts (37) and (75).

Abstract: Friction plates (53, 67) have a friction surface which contacts a friction surface on reaction plates (54, 68) to limit the torque transferred in a drive train, after the engine, in a snowmobile, while still allowing torque transmission at a predetermined level.