Constant Mesh Transmission - Honda Motorcycle Service Manual

TRANSMISSION
CONSTANT MESH TRANSMISSION
The constant mesh transmission consists of the following
components:
The mainshaft, with its fixed and sliding gears.
The countershaft, with its fixed and sliding gears.
.
The shift forks.
The shift drum.
Power is transmitted through the clutch t o the mainshaft
From the mainshaft, power may be transmitted through
several gear sets t o the countershaft.
M1 through M 5 are the gears on the mainshaft and C1 through
C5 are the countershaft gears.
The gear sets are comprised of opposing gears, one gear on
each shaft.
The illustration on the right shows the gear sets, pairing the
mainshaft number with the countershaft number ( M l I C l ,
M2iC2, etc.).
Selection of the proper gear set is done by moving a sliding
gear into contact with the gear set desired.
Connection of the sliding gear and the gear set is done using
dogs and dog holes on the sides of the gears.
In the illustration, gears M3, C4, and C5 are the sliding gears.
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1
CRANKSHAFT
I -
The sliding gears are moved by shift forks which ride on the
shift drum. Cam grooves cut in the shift drum move the shift
forks as the drum rotates.
Rotation of the shift drum is done by working the gearshift
pedal.
The relative positions of the transmission at the respective changing position are shown below
2nd gear
3rd gear
Date of Issue: Sep.. 1988
o
HONDA MOTOR CO., LTD.
13-5