KYMCO Dink 50, Service Manual

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7
. CYLINDER/PISTON
7-3
DINK 50/125
SERVICE INFORMATION
GENERAL INSTRUCTIONS
•
The cylinder and piston can be serviced with the engine installed in the frame.
•
When installing the cylinder, use a new cylinder gasket and make sure that the dowel pins are
correctly installed.
•
After disassembly, clean the removed parts and dry them with compressed air before inspection.
SPECIFICATIONS(DINK 125)
Unit: mm (in)
Item
Standard Service Limit
I.D.
52.4
～
52.41 (2.096
～
2.0964) 52.5 (2.1)
Warpage
⎯
0.05 (0.002)
Cylindricity
⎯
0.05 (0.002)
True roundness
⎯
0.05 (0.002)
Ring-to-groove Top 0.015
～
0.05 (0.006
～
0.002) 0.09 (0.0036)
clearance
Second 0.015
～
0.05 (0.006
～
0.002) 0.09 (0.0036)
Top 0.15
～
0.3 (0.006
～
0.012) 0.5 (0.02)
Piston, Ring end gap Second 0.15
～
0.3 (0.006
～
0.012) 0.5 (0.02)
piston ring Oil side rail 0.2
～
0.9 (0.008
～
0.036)
⎯
Piston O.D. 52.37
～
52.39 (2.0948
～
2.0956) 52.3 (2.092)
Piston O.D. measuring position
9 mm (0.36 in) from bottom of skirt
⎯
. Piston-to-cylinder clearance
0.01
～
0.04 (0.0004
～
0.0016) 0.1 (0.004)
Piston pin hole I.D.
15.002
～
15.008 (0.60008
～
0.60032) 15.04 (0.6016)
Piston pin O.D
14.994
～
15 (0.59976
～
0.6) 14.96 (0.5984)
Piston-to-piston pin clearance
0.002
～
0.014 (0.00008
～
0.00056) 0.02 (0.0008)
Connecting rod small end I.D. bore
15.016
～
15.034 (0.60064
～
0.60136) 15.06 (0.6024)
Cylinder