Gearbox; Gearbox Shafts; Disassembling The Gearbox; Checking The Primary Shaft - APRILIA RS4 125 Service Station Manual

Engine

Gearbox

Gearbox shafts

Disassembling the gearbox

•
Open the crankcase halves.
•
Remove the gaskets from the crank-
case.
•
Take out both fork rods and the trans-
mission forks (1) (2).
•
Take out the desmodromic control (3).
•
Take out the secondary axle (4).
•
Take out the primary axle (5).
See also
Crankcase opening

Checking the primary shaft

COUPLING CLASSES
The gears of the primary drive are classified according to the coupling with the gear of the clutch housing
and with the gear of the balancing countershaft and follow the logic shown in the tables listed below:
COUPLING CLASSES CLUTCH HOUSING - FIRST GEAR SHAFT
Coupling classes on Crankcase
X
Y
COUPLING CLASSES FIRST GEAR SHAFT - BALANCING COUNTERSHAFT
Coupling classes on Crankcase
S
T
NOTE
ENG - 140
Clutch housing gear
X
Y
Transmission gear
S
T
RS4 125
Transmission gear
X
Y
Balancing countershaft gear
S
T