APRILIA SX 125 Service Station Manual page 124

Engine
•
Insert the gear shaft pre-assembled in
the crankcase.
SET THE GEAR TO IDLE AND MAKE SURE BOTH THE
SECONDARY AND THE MAIN SHAFTS MOVE SMOOTHLY.
ENGAGE 3rd GEAR AND TURN THE SHAFT TO LEFT AND
RIGHT UNTIL THE LATCH TOUCHES THE RELEVANT PIN
ON THE DESMODROMIC DRUM. THERE SHOULD BE THE
SAME CLEARANCE ON BOTH SIDES. IF CLEARANCES
DIFFER, FOLD THE TAB AS REQUIRED.
•
Place the two countershaft control gears.
MAKE SURE ALL THE MARKS ARE ALIGNED.
ENG - 124
RX SX 125