Sym MB10A7-A series Service Manual page 126

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Measure the piston outer diameter.
Caution
Measure the piston outer diameter 90
degrees to the piston pin hole.
Service limit：52.25 mm
Calculate the clearance between the piston
and cylinder.
Measure the piston ring thickness.
Service limit：0.90 mm
To this chapter contents
8. Cylinder / Piston
8-7