Piston Diameter - HYOSUNG RT 125 D Service Manual

⊙ ⊙ CYLINDER BORE
Measure the cylinder bore diameter at six place.
If any one of the measurements exceeds the limit,
overhaul the cylinder and replace the cylinder.
Standard
Cylinder bore
57.000 ~ 57.015 mm
(2.2441 ~ 2.2447 in)
Cylinder gauge set : 09900-20508
⊙ ⊙ PISTON DIAMETER
INSPECTION
Measure the outside diameter of the piston in the
direction perpendicular to the piston pin axis at the
height from the skirt as shown in the illustration using
a micrometer.
If the measurement is found less than the service
limit, replace the piston.

Piston diameter

Micrometer(50 ~ 75 mm) : 09900-20203
⊙ ⊙ PISTON TO CYLINDER
CLEARANCE
To determine the piston to cylinder clearance,
calculate the difference between the cylinder bore
and outside diameter of the piston.
Standard
Piston to
cylinder
0.050 ~ 0.060 mm
clearance
(0.0020 ~ 0.0024 in)
Service limit
57.080 mm
(2.2472 in)
Service limit
56.880 mm (2.2394 in)
Service limit
0.120 mm
(0.0047 in)
39
ENGINE 3-16
15 mm (0.6 in)