APRILIA SX 125 User Manual

Refitting the crankcase halves
•
Unscrew and remove the fixing bolt and the washer from the support.
•
Apply LOCTITE Anti-Seize to each bearing seat of the shafts.
•
Fit the crankcase gasket on the flywheel-side crankcase half.
•
Insert the O-ring in the crankshaft.
ALWAYS USE NEW GASKETS.
NOTE
THE CRANKCASE GASKET MAY BE GREASED TO KEEP IT IN POSITION. THE CRANKCASE
GASKET MUST MATCH ALL THE HOLES ON THE CRANKCASE. OPERATE WITH CAUTION SO
THAT THE COUPLING DOES NOT LEAK.
•
Warm the clutch side crankcase half at
50 - 60 °C and couple it to the flywheel
side crankcase half.
ALWAYS USE NEW GASKETS.
NOTE
THE CRANKCASE GASKET MAY BE GREASED TO KEEP
IT IN POSITION. THE CRANKCASE GASKET MUST MATCH
ALL THE HOLES ON THE CRANKCASE. OPERATE WITH
CAUTION SO THAT THE COUPLING DOES NOT LEAK.
•
Fix again the crankcase to the support
by tightening the bolts.
•
Screw both crankcase halves with new
M6 Allen screws.
TIGHTEN THE SCREWS CROSSWISE STARTING GRADU-
ALLY FROM THE CRANKCASE CENTRE. USE AN ADDI-
TIONAL SEALING RING ON THE COOLANT DRAINAGE
SCREW. USE A KNIFE TO CUT THE PROTRUDING SEC-
TIONS OF THE CRANKCASE GASKETS ON THE CYLIN-
DER CENTRING. OPERATE WITH CAUTION SO AS NOT
TO DAMAGE THE SEAL SURFACE.
•
Fix the spring, the ring, the lever and
the washer with the M6 Allen screw.
NOTE
MAKE SURE THE LEVER MOVES SMOOTHLY.
RX SX 125 Engine
ENG - 123

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