Sym MAXSYM 400i Service Manual page 125

7. Cylinder / Piston
Measure the cylinder upper surface for warpage.
Service limit: 0.05 mm
Measure the clearance between piston rings and
ring grooves.
Service Limit: Top ring: 0.09 mm
nd
2 ring: 0.09 mm
Remove piston rings
Check if the piston rings are damaged or its
grooves are worn.
Caution
Pay attention to remove piston rings because
they are fragile.
Place piston rings respective into cylinder below
20 mm of cylinder top. In order to keep the piston
rings in horizontal level in cylinder, push the rings
with piston.
Measure the piston ring end gap.
Service Limit: Top ring: 0.50 mm
nd
2 ring: 0.65 mm
7-4
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