Honda CB250N Shop Manual page 158

CB250
Addendum
p
Cylinder/Piston
Unit:
mm
(in)
Item
Standard
Service Limit
Cylinder
I.D.
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)
(H)
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)
1
0
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)
0.0
1
5
-
0.040 (0.0006
-
0,0.0
1 6)
0.015-0.040(0.0006-0.0016)
0.15
-0.30(0.006-0.012)
;
0.30-0.45
(0.012-0.018)
0.2-0.7
(0.01 -ff.03)
"N" mark
side facing
up
*N" mark
side facing
up
53.10 (2.091)
0.05 (0.002)
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)
—
Crankshaft
—
Connecting rod small
end
I.D.
Connecting rod
big
end
side
clearance
radial
clearance
Crankshaft runout
(at
both ends)
©
'
(at
bearing
holder)©
55
mm
(2.17 in
13
mm
(0.51 in)
©
**l 39.5
mm
(1.56
in)'
9.5
mm
(0.37 in)
Crank
pin
oil.
clearance
Crank
pin
bearing
selection
Main
journal
oil
clearance
Main
journal bearing
selection
15.016 - 15.034 (0.5912 - 0.5919)
0.10-0.40 (0.004-0.016)
0.004
-
0.01 2 (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.
19-6