Checking The Primary Shaft; Checking The Secondary Shaft; Checking The Desmodromic Drum - APRILIA SX 125 Service Station Manual

RX SX 125
•
Rotate the crankcase half on the sup-
port to the standard position.
•
Remove gearbox unit (primary + sec-
ondary).

Checking the primary shaft

•
Check the state of the joints and
grooves. Max. admissible deviation (A)
0.03 mm (0.0012 in); Min. wear limit (B)
Diam. 24.96 mm (0.9827 in). Min. wear
limit (C) Diam. 20.96 mm (0.8260 in).
Min. wear limit (C) Diam. 16.97 mm
(0.6681 in).

Checking the secondary shaft

•
Check the state of the joints and
grooves. Max. admissible deviation (A)
0.03 mm (0.0012 in); Min. wear limit (B)
Diam. 24.96 mm (0.9827 in). Min. wear
limit (C) Diam. 20.96 mm (0.8260 in).
Min. wear limit (C) Diam. 16.97 mm
(0.6681 in).

Checking the desmodromic drum

•
Check the contact zone on fork (1) and the driving pin (2) of the forks for wear.
•
Check the desmodromic drum grooves (3) for wear.
•
Make sure that both ball bearings (4) rotate freely and check if there are signs of corrosion.
Engine
ENG - 91