Suzuki GN125F, Service Manual

Page: 48 / 148

E N G I N E
3-17
CYLINDER AND PISTON
CYLINDER REMOVAL
INSPECTION
09900-20803: Thickness gauge
09900-20508: Cylinder gauge set
09910 34510: Piston pin remover -
PISTON REMOVAL AND INSPECTION
REMOVAL
Place a clean rag over the cylinder base to prevent
piston pin circlip from dropping into crankcase.
Hold the piston stably when taking out the piston pin
to prevent the damage to conrod big end bearing.
When removing the piston ring, be careful not to
damage the piston. Do not expand the piston ring
excessively since it is apt to be broken down.
Remove the cylinder head. (Refer to page 3-7)
Remove the gasket, dowel pins and guide rod.
Remove the cylinder.
Clean the remaining gasket on the cylinder surface
Check the gasketed surface of the cylinder for distortion
with a stragihtedge and thickness gauge.
.
Inspect the cylinder bore for wear or damage.
Measure the cylinder bore diameter at six places. If any one
of the measurements exceeds the limit, overhaul the
cylinder and replace the piston with an oversize, or replace
the cylinder.
Remove the piston pin circlip
Remove the piston pin and piston with the special tool.
.
Remove the piston rings one by one by expanding the gap
symmetry
.
Cylinder distortion limit: 0.05 mm
Cylinder bore diameter limit : 57.135 mm
CAUTION