Motorcycle transmission shifter mechanism

A motorcycle comprising:

• two wheels;
• a frame supported by the two wheels;
• an engine supported by the frame;
• and
• a transmission shifter assembly adjacent the engine and including:
• a cam drum having at least two pins extending therefrom;
• and
• a shift mechanism engageable with the pins and having:
• a tooth that is operable to engage a first one of the pins to rotate the drum in a first direction, and
• a stop that is operable to engage a second one of the pins to prevent over-rotation of the drum in the first direction.

A motorcycle transmission shifter assembly comprising:

• a cam drum having a plurality of pins extending therefrom;
• a shift pawl engageable with the pins and including
• a first tooth operable to engage a first one of the pins to rotate the drum in a first direction,
• a second tooth operable to engage a second one of the pins to rotate the drum in a second direction,
• a stop that is operable to engage a third one of the pins to prevent over-rotation of the drum in the first direction;
• and
• a shift lever pivotally coupled to the shift pawl and including a stop that is operable to engage a fourth one of the pins to prevent over-rotation of the drum in the second direction.