APRILIA SX 125 User Manual

•
The lever roller (6) must rotate freely.
•
Check that the stop tab (7) and the rel-
evant spring (8) work properly.
•
Check that the gear shaft is not de-
formed. (A) Max. admissible deviation
= 0.15 mm (0.0059 in);
•
Check that both fork shafts are not de-
formed. (B) Max. admissible deviation
= 0.05 mm (0.0020 in);
THE END OF THE FORK LONG SHAFT (9) THAT PRO-
TRUDES FROM THE CRANKCASE IS USED AS A TRANS-
MISSION STOP AND CAN BE BENT IN CASE OF EXCES-
SIVE LOAD (BUMPING).
THE DEVIATION CAN BE CHECKED BY REMOVING THE
CLUTCH COVER AND ROTATING THE LONG SHAFT.
Assembling the gearbox
•
Place the guiding sleeve on the pri-
mary shaft to avoid damaging the oil
seal.
•
Heat up the engine crankcase.
•
Apply LOCTITE Anti-Seize on the
bearing seats present on the crank-
case.
•
Fit the bearings in their seats.
•
Fit the gear unit.
•
Fit the 5th - 6th gear fork on the gear
pinion of the secondary shaft.
•
Place the 2nd - 3rd gear fork and the
1st - 4th gear fork on the gear pinion of
the primary shaft. The 2nd - 3rd gear
fork must be installed with the printed
number 123 facing upwards. The 1st -
4th gear fork must be installed with the
printed number 113 facing upwards.
Engine RX SX 125
ENG - 92

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