Cylinder Inspection - Honda GL1800 Service Manual

Insert each piston ring into the bottom of the cylin-
der squarely using the piston crown.
Measure the ring end gap.
SERVICE LIMITS: Top: 0.5 mm (0.02 in)
Second: 0.6 mm (0.02 in)
Oil (side rail): 0.9 mm (0.04 in)
Measure the piston O.D. at a point 10 mm (0.4 in)
from the bottom and 90° to the piston pin hole.
SERVICE LIMIT: 73.85 mm (2.907 in)

CYLINDER INSPECTION

Inspect the cylinder wall for scratches or 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.
SERVICE LIMIT: 74.10 mm (2.917 in)
Calculate the cylinder-to-piston clearance.
SERVICE LIMIT: 0.10 mm (0.004 in)
Calculate the cylinder taper and out-of-round at
three levels on the X and Y axes. Take the maximum
reading to determine the taper and out-of-round.
SERVICE LIMITS: Taper: 0.10 mm (0.004 in)
Out-of-round: 0.10 mm (0.004 in)
The cylinder must be rebored and an oversize pis-
ton fitted if the service limits are exceeded.
The following oversize pistons are available:
– 0.25 mm (0.010 in)
– 0.50 mm (0.020 in)
– 0.75 mm (0.030 in)
– 1.00 mm (0.040 in)
CYLINDER/PISTON/CRANKSHAFT
Y
X
MIDDLE
BO OM
OP
11-9