KYMCO XCITING S 400 Manual page 127

XCITING 400i
3. Engine > Cylinders and Pistons
The two upper rings are each a single piece of metal. The oil ring
consists of an expander ring and two side rails.
Clean the carbon build up off of the piston with a stiff bristled plastic
brush or rag. Never use a wire brush to clean a piston.
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