[ducked]

0) Checking piston ring end gap
After the cylinder has been checked or reconditioned,
insert the piston ring into the cylinder bore down to a
point about 110 mm (4.3 inches) measured from the
cylinder head gasket attaching surface. Then, meas-
ure the piston ring end gap.
NOTE:
Apply engine oil to the piston ring before inserting it.

[CB-80 engine]
Compression ring No.1
0.35 - 0.70 rnm (0.014 - 0.028 inch)
Compression ring No.2
0.28 - 0.70 mm (0.01 1 - 0.028 inch)
Oil ring 0.20 - 1.10 rnm (0.008 - 0.043 inch)

End gap

If the end gap exceeds the specified limit, replace
piston ring as a set.

Piston ring
[CB-23 & CB-61 engines] Fig. 5-255
Compression ring No.1
0.20 - 0.70 mrn (0.079 - 0.028 inch)
Compression ring No.2
0.20 - 0.70 mm (0.079 - 0.028 inch)
Oil ring 0.20 - 1.10 mm (0.079 - 0.043 inch)