Sym MB10A7-A series Service Manual page 127

8. Cylinder / Piston
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Piston Rings Assembly
Clean up the piston and ring grooves.
Install the piston rings onto piston carefully.
Place the opening of piston rings as diagram shown.
Caution
Do not damage the piston and piston rings during installation.
All marks on the piston rings must face up side.
Make sure that all piston rings can be rotated freely after installation.
Top groove
Second groove
Oil groove
8-8
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120°
20 mm
Top ring
Second ring
Side rail
Spacer
Oil ring
Side rail