Cylinder Removal; Cylinder Wear Inspection - DAELIM HISTORY 125 Service Manual

CYLINDER / PISTON
CYLINDER
REMOVAL
● Remove the engine from the frame. (⇨6-2 )
● Remove the EX. pipe. (⇨4-12 )
● Remove the camshaft. (⇨9-3 )
● Remove the cylinder head. (⇨9-5 )
● Remove the cam chain guide from the cylinder.
● Remove the cylinder.
● Remove the gasket and dowel pin. Carefully remove
any adhering gasket material from the cylinder / head
mating surface. Do not scratch the surface.
NOTE
·Take care not to damage the cylinder mating surface.
WEAR INSPECTION
● Inspect the cylinder wall for scratches and wear.
● Measure and record the cylinder inner diameter at three
levels in both an X and Y axis.
● Take the maximum reading to determine the cylinder
wear.
SERVICE LIMIT : 56.100 mm
● Measure the piston outer diameter.
● Calculate the piston-to-cylinder clearance. Take the
maximum reading to determine the clearance.
SERVICE LIMIT : 0.2 mm
● Calculate the cylinder for out-of-round at three levels in
an X and Y axis. Take the maximum reading to
determine the out-of-round.
● Calculate the cylinder for taper at three levels in an X
and Y axis. Take the maximum reading to determine
the taper.
● If any of the cylinder measurements exceed the service
limits, replace the cylinder.
SERVICE LIMIT : OUT-OF-ROUND : 0.005 mm
TAPER : 0.05 mm
10-2
CAM CHAIN
CYLINDER
COMP
TOP
MIDDLE
BOTTOM
GUIDE
DOWEL PIN
PISTON
CYLINDER GAUGE