Shift Start; Shift Finish; Shift Return - Honda Motorcycle Service Manual

TRANSMISSION
Shift Start
Pushing down on the shift pedal turns the spindle
counterclockwise. Because the gear plate is fixed, the
planetary gears turn clockwise, turning the drum shifter
counterclockwise.
As the drum shifter turns counterclockwise, the right pawl
engages the detent in the shift drum, while the left pawl is
pushed out of the way into the shifter by the guide plate. With
the pawl engaged, the drum shifter turns the shift drum, mov-
ing the shift forks into place.
Shift Finish
To prevent the drum from rotating too far, a shift drum stopper
plate is used. The shift drum stopper plate rotates on an eccen-
tric pivot moved by the spindle assembly.
As the spindle reaches the end of its travel, one leg of the stop-
per plate is moved up to contact a positive stop on the shift
drum. At the same time the spindle assembly is prevented
from moving too far by the shift arm stopper pin.
Shift Return
When the shift pedal is released, the shift return spring brings
the spindle assembly back to the centered position.
At this time, the drum shifter rotates and the ratchet feature
allows the right pawl to disengage from the shift drum. As the
drum shifter rotates, the drum stopper arm prevents the shift
drum from moving.
RATCHET PA CHET PAWL
PROJECTION
SHIFT ARM
STOPPER PI
RUM STOPPER PLATE
,RATCHET
PLATE
GUIDE
1 3-4
Date of Issue: Nov.. 1989
O
HONDA MOTOR CO., LTD.