Cylinder; Wear Inspection - Honda Motorcycle Service Manual

CYLINDER
WARPAGE INSPECTION
Remove the cylinder (see the Model Specific manual).
Carefully remove any adhering gasket material from the
cylinderihead mating surface. Do not scratch the surface.
Check the cylinder for warpage by placing a straight edge and
a feeler gauge across the stad holss. Replace the cylinder if the
service limit is exceeded.
NOTE
~- ~-
.
Any clearance between the cylinder and head due to
damage or warpage will result in compression leaks and
reduced performance.
WEAR INSPECTION
Inspect the cylinder wall for scratches and wear.
NOTE
-
Inspect the area near T.D.C. (Top Dend Center) care-
fully Thls area 1 s especially sub~ect t o wear due to the
possibility of borderline lubrtcation from heat and top
rina com~ression.
Measure and record the cylinder I.D. at three levels in both an
X and Y axis.
Take the maximum reading to determine the cylinder wear.
NOTE
-
Two-stroke engines: avoid the intake and exhaust ports
when measuring.
Measure the piston O.D. (see page 10-71.
Calculate the piston-to-cylinder clearance. Take the maximum
reading to determine the clearance.
Calculate the cylinder for taper at three levels in an X and Y
axis. Take the maximum reading to determine the taper.
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.
If any of the cylinder measurements exceed the service limits
and oversized pistons are available, rebore to next smallest
size possible and install the proper pistons. Otherwise, replace
the cylinder.
STRAIGHT EDGE
. -
V
\ I
FEELER GAUGE
CYLINDER
HEAD SIDE
t
CYLINDER GAUGE
TOP X
MIDDLE
BOTTOM
X TOP
MIDDLE
PORTS
BOTTON
Date of Issue: Nov., 1989
8
HONDA MOTOR CO., LTD.