KYMCO G-Dink 125i Manual page 155

2. Engine > Cylinders and Pistons
Measure the outside diameter of the piston at 9 mm up from the bottom
of the skirt at a 90° angle to the piston pin. Measure the piston with
vernier calipers or a micrometer. Check the piston for wear, damage,
and extreme discoloration.
Subtract the diameter of the piston from the maximum front to rear
diameter measurement of the cylinder to calculate the piston-to-cylinder
clearance. Replace the piston and cylinder as needed to achieve a
correct piston-to-cylinder clearance.
Piston-to-cylinder clearance
Measure the piston pin diameter with a micrometer. Measure the piston
pin bore diameter with vernier calipers or a small bore gauge. Measure
at three different points for each. Replace the parts if any of the
specifications are not met.
Piston pin hole I.D.
Piston pin O.D.
Piston-to-piston pin clearance
Item
Item
Standard (mm)
0.010 - 0.030
Standard (mm)
15.002 - 15.008
14.994 - 15.000
0.002 - 0.014
G-Dink 125i
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