Piston And Piston Ring - HYOSUNG MS3 250 Sercie Manual

3-25 ENGINE

PISTON AND PISTON RING

▣ ▣ PISTON DIAMETER INSPECTION
Measure the outside diameter of piston in the direc-
tion 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
72.880 mm
(2.8693 in)
Micrometer(50 ~ 75 mm) : 09900-20203
▣ ▣ PISTON-TO-CYLINDER CLEARANCE
To determine the piston-to-cylinder clearance, calcu-
late the difference between the cylinder bore and out-
side diameter of the piston.
Standard
Piston-to-
cylinder
0.050~0.060 mm
clearance
(0.0020~0.0024 in)
Micrometer(0 ~ 25 mm) : 09900-20201
▣ ▣ PISTON PIN HOLE BORE
Using a dial calipers, measure the piston pin hole
bore both the vertical and horizontal directions.
If the measurement exceeds the service limit, replace
the piston with a new one.
Piston
pin
hole
19.030 mm
bore
(0.7492 in)
Dial calipers : 09900-20605
Service limit
56.880 mm
(2.2394 in)
Service limit
0.120 mm
(0.0047 in)
Service limit
15.030 mm
(0.5917 in)
15 mm (0.6 in)