Sym GTS 250 Service Manual page 91

7. Cylinder / Piston
Check cylinder if warp.
Service limit: 0.05 mm
Measure clearance between piston rings and
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.
Service Limit: Top ring: 0.50 mm
nd
2 ring: 0.65 mm
7-4
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