Honda CB250N Shop Manual page 13

General Information
Cylinder/Piston
Unit:
mm
(in)
Item dard Service
Limit
Cylinder
1.0.
out of
round
taper
warpage
Piston
mark
direction
Piston O.D.
(D)
Piston
O.D.
measurement
point (H)
Piston pin hole
I.D. (d)
(d)
Cylinder-to-piston clearance
Piston pin
O.D.
Piston-to-piston pin clearance
Connecting rod-to-piston pin clearance
Top
ring-to-ring
groove
clearance
Second
ring-to-ring
groove clearance
Top
ring
end gap
Second
ring
end gap
Oil ring (side
rail)
end gap
Top
ring
mark
Second
ring
mark
53.000-53.010 (2.0866-2.0870)
"IN" mark
facing
toward
the intake side
52.970-52.990 (2.0854-2.0862)
10
mm
(0.4
in)
from
the
bottom
15.002-15.008(0.5906-0.5909)
0.010-0.040 (0.0004-0.0016)'
14.994— 15.000 (0.5903-0,5906)
0.002-0.014
(0.0001
-0.0006)
0.016-0.040
(0.0006-0.0016)
0.015-0.040
(0.0006-0.0016)
0.015-0.040 (0.0006-0.0016)
0.15-0.30(0.006-0.012)
0.30-0.45
(0.012-0.013)
0.2-0.7
(0.01-0.03)
"N"
mark side facing up
"N"
mark
side facing
up
53.10
(2.091
0.05
10.002)
0.05 (0.002)
0.05 (0.002)
52.90
(2.083)
15.05 (0.593)
0.10
(0.004)
14.98
(0.590)
0.07
(0.003)
0.10 (0.004)
0.10 (0.004)
0.10
(0.
004)
0.45
(0.018)
0.60
(0.024)
0.90
(0.036)
r—
Crankshaft
—
Connecting
rod small
end
I.D.
Connecting
rod big
end
side
clearance
.
radial
clearance
Crankshaft runout
(at
both ends)
CD
(at
bearing
holder)
.J)
55
mm
(2.17
in
13
mm
J
(0.51
in)
Crank-
pin
oil
clearance
Crank
pin
bearing selection
Main
journal-oil clearance
Main
journal
bearing selection
39.5
mm
(1.56
in)
9.5
mm
(0.37
in)
15.016-15.034 (0.5912-0.5919)
0.10-0.40
(0.004-0.01
6)
0.004-0.012 (0.0002-0.0005)
15.08 (0.594)-
0.6(0.02)
0.05 (0.002)
0.03
(0,001)
0.05 (0.002)
—
Kickstarter
-.
Kickstarter pinion gear
I.D.
Kickstarter spindle
O.D.
Kickstarter
idle
gear
I.D.
Countershaft O.D.
at
kickstarter
idle
gear
Kickstarter
idle
gear bushing O.D.
I.D.
•