Honda SH125 Manual page 189

CYLINDER/PISTON
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Never use a wire
Clean carbon deposits from the ring grooves with a
brush, it w / / / scratch
ring that will be discarded.
the groove.
CYLINDER STUD BOLT
REPLACEMENT
Thread two nuts onto the stud and tighten them
together, and use the wrench on them to turn the
stud bolt out.
Install new stud bolts.
TORQUE: 9 N-m (0.9 kgf-m, 6.6 I b f W
Be sure to verify the stud height from the crankcase
surface.
Adjust the height if necessary.
SPECIFIED LENGTH:
Left (drive pulley) side: 181.5 mm (7.15 in)
Right (flywheel side) side: 175.5 mm (6.91 in)
CYLINDER/PISTON INSPECTION
CYLINDER
Inspect the cylinder wail for scratches or wear.
Measure the cylinder I.D. a t three levels i n the X and
Y
axis. Take the maximum reading to determine the
cylinder wear.
SERVICE LIMITS:
SH125: 52.44 mm (2.065 in)
SH150: 58.04 mm (2.285 in)
Calculate the taper and out-of-round at three levels
in the X and Y axes. Take the maximum reading to
determine both measurements.
SERVICE LIMITS:
Taper: 0.05 mm (0.002 in)
Out-of-round: 0.05 mm (0.002 in)
The cylinder must be rebored and an oversize pis-
ton/piston rings fitted if the service limits are
exceeded.
The following oversize pistons/piston rings are
available:
0.25 mm (0.010
in)
0.50 mm (0.020 in)
The piston-to-cylinder clearance for the oversize pis-
ton must be
0.010
-
0.040 mm (0.0004
-
0.0016 in).
Y
9-6