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7. CYLINDER/PISTON 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. 52.452.41 (2.0962.0964) 52.5 (2.1)
Warpage 0.05 (0.002)
Cylinder
Cylindricity 0.05 (0.002)
True roundness 0.05 (0.002)
Ring-to-groove Top 0.0150.05 (0.0060.002) 0.09 (0.0036)
clearance Second 0.0150.05 (0.0060.002) 0.09 (0.0036)
Top 0.150.3 (0.0060.012) 0.5 (0.02)
Piston, Ring end gap Second 0.150.3 (0.0060.012) 0.5 (0.02)
piston ring Oil side rail 0.20.9 (0.0080.036)
Piston O.D. 52.3752.39 (2.09482.0956) 52.3 (2.092)
Piston O.D. measuring position 9 mm (0.36 in) from bottom of skirt
. Piston-to-cylinder clearance 0.010.04 (0.00040.0016) 0.1 (0.004)
Piston pin hole I.D. 15.00215.008 (0.600080.60032) 15.04 (0.6016)
Piston pin O.D 14.99415 (0.599760.6) 14.96 (0.5984)
Piston-to-piston pin clearance 0.0020.014 (0.000080.00056) 0.02 (0.0008)
Connecting rod small end I.D. bore 15.01615.034 (0.600640.60136) 15.06 (0.6024)
7-3