Honda CBR125R, Owner'S Manual

Page: 218 / 430

CYLINDER/PISTON
9-6
Never use a wire
brush; it will scratch
the grooves.
Clean carbon deposits from the piston ring grooves
with a used piston ring that will be discarded.
INSPECTION
CAM CHAIN GUIDE
Check the cam chain guide for excessive wear or
damage, replace if necessary.
CYLINDER
Check the cylinder wall for scratches and wear.
Measure the cylinder I.D. at three levels on the X
and Y axes. Take the maximum reading to deter-
mine the cylinder wear.
Calculate the cylinder-to-piston clearance (page 9-
7).
Calculate the cylinder taper and out-of-round at
three levels on the X and Y axis. Take the maximum
reading to determine the taper and out-of-round.
The cylinder must be rebored and an oversize pis-
ton fitted if the service limits are exceeded.
The following oversize pistons are available:
The cylinder-to-piston clearance for the oversize pis-
ton must be: 0.010 – 0.040 mm (0.0004 – 0.0016 in).
PISTON PISTON RING
CAM CHAIN GUIDE
SERVICE LIMIT: 58.05 mm (2.285 in)
CYLINDER
SERVICE LIMITS:
Taper: 0.010 mm (0.0004 in)
Out-of-round: 0.010 mm (0.0004 in)
These parts
numbers may be
change without
written permission.
0.25 mm (0.010 in): 13012-KGH-305
0.50 mm (0.020 in): 13013-KGH-305
0.75 mm (0.030 in): 13014-KGH-305
1.00 mm (0.040 in): 13015-KGH-305
TOP
MIDDLE
BOTTOM