APRILIA SX 125 User Manual

•
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.
RX SX 125 Engine
ENG - 91

APRILIA SX 125 Specifications

General

Displacement	124.2 cc
Cooling System	Liquid cooled
Fuel System	Electronic fuel injection
Transmission	6-speed
Rear Suspension	Monoshock
Front Tire	100/80-17
Rear Tire	130/70-17
Compression Ratio	12.5:1
Starter	Electric
Clutch	Wet multi-plate
Front Brake Disc	300 mm
Rear Brake Disc	220 mm
Dry Weight	134 kg
Bore x Stroke	58 mm x 47 mm
Max Power	11 kW (15 HP) @ 10, 000 rpm
Front Suspension	41 mm USD fork
Front Brake	Single 300 mm disc
Rear Brake	Single disc
Fuel Tank Capacity	7 liters
Frame	Steel perimeter
Engine Type	Single-cylinder, 4-stroke