Honda CB250N Shop Manual page 12

General Information
r—
Cylinder
Head
Unit:
mm
(in)
Item Standard Service
Limit
Cylinder
compression
(kPa
(kg/cm
2
,
psi)/500-600
mirr' (rpm)j
Cylinder
compression
difference
(kPa
(kg/cm
3
,
psi)/500-600 min->
(rpm)j
Valve clearance
IN
EX
Cylinder
head warpage
Cam
lobe height
©
IN
EX
Camshaft
runout
Camshaft
oil
clearance
A
B
AiaifiDnJi
Qi®
Camshaft
journal O.D.
A
B
Camshaft bushing
I.D.
Camshaft
holder
I.D.
A
B
Valve stem
O.D.
IN.
EX
Valve guide
I.D.
IN
EX
Stem-to-guide clearance
IN
EX
'
Valve guide
projection
above
cylinder
head
IN
EX
Before guide
installation:
1. Chill
the valve guides
in
the freezer section- of
the refrigerator (or
about an hour
2.
Heat
the cylinder
head
to
100-150°C
(212-300 D
F)
Valve
seat width
Valve
spring free length IN
EX
inner IN
inner
EX
outer
IN
outer
EX
Rocker arm
I.D. IN
EX
Sub-rocker
arm
I.D.
IN
EX
Rocker
arm
shaft O.D.
IN
EX
Sub-rocker
arm
shaft O.D. IN
EX
Rocker arm-to-rocker
arm
shaft
clearance
Sub-rocker arm-to-rocker
arm
shaft
clearance
Valve
lifter
O.D.
Valve
lifter
bore
I.D.
Hydraulic lash adjuster assist spring free length
Hydraulic
lash
adjuster
compression
stroke
with kerosene
1,400-1,500 (14-15, 199-213)
100
11,
14)'
0.06-0.10
(0.002-0.004)
0.06-0. 10'
10.
002-0.004)
27.383-27.543 (1.0781-1.0844)
27.209-27.369 (1.0712-1.0775)
19.967-19.980 (0.7861-0.78661
20.063-20.083 (0.7899-0.7907)
5.450-5.465 (0.2146-0.2152)
5.430-5.445 (0.2138-0.2144)
5.475-5.485 (0.2156-0.2159)
5.475-5.485 (0.2156-0.2159)
0.010-0.035 (0.0004-0.0014)
0.030-0.055 (0.0012-0.0022!
.1.0-1
:-1
(0.039-
0..043)
29.9
(1.18)
29.9
(1.18)
38.2
(1
.50)
38.2
(1
.501
10.000-10.015 (0.3937-0.3943)
10.000-10.015 (0.3937-0.3943)
9.978-9.987 (0.3928-0.3932)
9.978-9.-987 (0.3928-0.3932)
0.013-0.037
(0.0005-0.0015)
800
(8,
1
14)
0.10
(0.004)
27.2
(1.071
27.0
(1.06)
0.05
(0.002)
19.92 (0.784)
20.20
(0.795)
5.42
(0.213)
5.40 (0.213)
5.50
(0.217)
5.50
(0.217)
0.08
(0.003)
0.10
(0.004)
1.8 (0.07)
29.0 (1.14)
29.0
(1.14)
37.0
(1.46)
37.0
(1,461
10.10
(0.398)
10.10
(0.398)'
9.91 (0.390)
9.91 (0.390)
0.05 (0.002)