APRILIA RX 125 Service Station Manual

•
The pin (2) should adjusted to the pis-
ton without considerable clearance.
•
Make sure the grooves of the seeger
rings (4) are not worn.
•
Measure the axial clearance of the
rings with a thickness gauge; max.
wear limit = 0.10 mm (0.0039 in).
•
Distance between the ends of the pis-
ton ring. Nominal distance between the
ends 0,05 - 0,20 mm (0.0019 - 0.0079
in) Max. wear limit 0.8 mm (0.032 in).
TO MEASURE THE DISTANCE BETWEEN THE ENDS OF A
PISTON RING, PLACE THE RING IN THE CYLINDER USING
THE PISTON AS A PUSHING TOOL AND CHECK THE DIS-
TANCE WITH A THICKNESS GAUGE.
Fitting the piston
•
Position the cylinder base gasket.
THE CRANKCASE GASKET SHOULD NOT PROTRUDE OR RECESSED COMPARED WITH THE
CYLINDER BASE SURFACE SO AS TO AVOID COOLANT LEAKING INTO THE CRANKCASE.
•
Place a seeger ring in the piston groove.
USE NEW SEEGER RINGS ONLY. MAKE SURE THE OPEN ENDS OF THE RINGS ARE FACING
DOWNWARDS.
RX SX 125 Engine
ENG - 109

APRILIA RX 125 Specifications

General

Displacement	124.2 cc
Max Power	11 kW (15 HP) @ 10, 700 rpm
Torque	11.2 Nm @ 8, 000 rpm
Fuel System	Electronic fuel injection
Transmission	6-speed
Rear Suspension	Monoshock
Front Brake	Single disc, 300 mm
Rear Brake	Single disc, 220 mm
Seat Height	905 mm
Weight	134 kg (dry)
Engine Type	Single cylinder, 4-stroke
Cooling System	Liquid-cooled
Front Suspension	Upside-down fork
ABS	Yes