KYMCO Downtown 350i Repair Manual page 222

4.Engine
Downtown 350i
Assembly
Clean the piston ring grooves and apply fresh engine oil to the piston rings.
Spread the rings the minimum amount possible to install them. Do not try and
force them on the piston.
Install the top and second rings with their markings facing up. Install the rings to
the piston as shown above so that no ring end gaps line up with the piston pin or
perpendicular to the piston pin. The rings should turn easily on the piston without
sticking or roughness.
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