KYMCO G-Dink 125i Manual page 160

2. Engine > Cylinders and Pistons G-Dink 125i
The "IN" mark should face the intake side (rear) of the engine.
Place the piston over the connecting rod. Insert the piston pin into the
piston and rod.
Install new piston pin clips securely into their grooves. Turn the gap in
the clips away from the access gap.
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