Cylinder; Wear Inspection - DAELIM Besbi SC125 Service Manual

CYLINDER / PISTON

CYLINDER

REMOVAL
Remove the engine from the frame.
Cylinder-head cover
Cam shaft holder
Cam shaft
Cylinder head
The cam chain guide from the cylinder
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 : 52.50 mm
Measure the piston outer diameter.
Calculate the piston-to-cylinder clearance. Take the
maximum reading to determine the clearance.
SERVICE LIMIT : 0.105 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