HYOSUNG COMET 125 Service Manual page 60

3-23 ENGINE
CAM CHAIN TENSIONER
Check the contacting surface of the cam chain tensioner.
If it is worn or damaged, replace it with a new one.
CAM CHAIN AND CAM CHAIN GUIDE
Check the cam chain for wear, damage and kinked or bind-
ing links. If any defects are found, replace it with a new
one.
Check the cam chain guide for wear and damage. If it is
found to be damaged, replace it with a new one.
PISTON DIAMETER INSPECTION
Measure the outside diameter of piston in the direction per-
pendicular 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
56.880 mm
Piston oversize
Micrometer(50~75 mm) : 09900-20203
Micrometer(25~50 mm) : 09900-20202
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-cylin-
0.05~0.06 mm
der clearance
(0.0020~0.0024 in)
Standard
Piston-to-cylin-
0.03~0.04 mm
der clearance
(0.0012~0.0016 in)
Service limit
43.890 mm
(2.2394 in)
(1.7280 in)
0.5, 1.0 mm (0.02, 0.04 in)
Service limit
0.120 mm
(0.0047 in)
Service limit
0.1 mm
(0.0040 in)
(0.6 in)