Cylinder/Piston Inspection - Honda 2000 XR50R Service Manual

CYLINDER/PISTON
CYLINDER/PISTON INSPECTION
8-4
Inspect the cylinder bore for wear or damage.
Measure the cylinder 1.0. in X and Y exis at three
levels.
Take the maximum reading to determine the cylin-
der wear.
SERVICE UMIT: 39.05 mm (1.537 in)
Calculate the piston-to-cylinder clearance.
Take a maximum reading to determine the clear-
ance.
Refer to page 8·5 for measurement of the piston O.
O.
SERVICE LIMIT: 0.15 mm (0.006 in)
Calculate the taper and out of round at three levels
in X and Y axis. Take the maximum reading to
determine them.
SERVICE UMITS:
Taper: 0.10 mm (0.004 in)
Out of round: 0.10 mm (0.004 in)
The cylinder must be rebored and an oversize
piston fitted
if
the service limit s are exceeded.
The following oversize pistons are available:
0.25
mm (0.010 in)
0.50 mm (0.020 in)
The piston to cylinder clea rance for the oversize pis-
ton must be: 0.010 - 0.040 mm (0.0004 - 0.0016
in).
Inspect the top of the cylinder f or warpage.
SERVICE LIMIT:
0.05
mm
(0.002 in)
Remove any carbon deposits f rom the piston ring
grooves, using an old piston ring as shown.
y
r,1':
TOP
x
MIDDLE
I
BOTTOM
t'--