PIAGGIO Liberty 125 User Manual

Maximum allowable run-out:
0.05 mm
- The cylinder rectifying operation should be car-
ried out with a surfacing that respects the original
angle.
- The cylinder surface roughness should be 0.9
micron.
- This is indispensable for a good seating of the
sealing rings, which in turn minimises oil consump-
tion and guarantees optimum performance.
- The pistons are oversized due to cylinder rectifi-
cation and are subdivided into three categories
1st, 2nd, 3rd with 0.2-0.4-0.6 mm oversize. They
are also classified into 4 categories A-A, B-B, C-
C, D-D.
Inspecting the piston
- Carefully clean the seal housings.
- Measure the coupling clearance between the seal rings and the grooves using suitable sensors, as
shown in the diagram.
- If the clearance is greater than that indicated in the table, replace the piston.
STANDARD COUPLING CLEARANCE
Name
Description Dimensions Initials Quantity
Top piston ring 0.025 ÷ 0.070
Middle piston ring 0.015 ÷ 0.060
oil scraper 0.015 ÷ 0.060
MAXIMUM ADMITTED CLEARANCE AFTER USE
Name
Description Dimensions Initials Quantity
Top piston ring 0.080 mm
Middle piston ring 0.070 mm
oil scraper 0.070 mm
Engine Liberty 125 - 200 4tempi
ENG - 94

PIAGGIO Liberty 125 Specifications

General

Displacement	124 cc
Fuel System	Electronic Injection
Front Suspension	Hydraulic telescopic fork
Rear Brake	140 mm drum
Front Tire	90/80 - 16"
Rear Tire	100/80 - 14"
Wheelbase	1, 340 mm
Length	1, 945 mm
Width	690 mm
Seat Height	790 mm
Engine Type	Single cylinder, 4-stroke
Torque	10.4 Nm @ 8, 000 rpm
Cooling System	Air cooled
Transmission	CVT
Rear Suspension	Single shock absorber
Front Brake	240 mm disc
Fuel Tank Capacity	6 liters
Weight	124 kg