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Honda CRF450X 2010 User Manual

Honda CRF450X 2010
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Page #175 background image
(
l _
l
SERVICE INFORMATION
GENERAL
CYLINDER
HEADIVALVES
This section covers service
of
the
camshaft, cyl
inder
head
and
valves. These services can be
done
wit
h the
engine
installed in
the
frame.
During disassembl
y,
mark
and
store
the
disassembled
parts
to
ensure
that
they
are reinstalled in
their
original
loca-
tions.
Clean all disassembled
parts
with
cleaning
sol
vent
and
dry
them
by
blow
in
g
them
off
wit
h
compressed
ai
r
before
in
spection.
Camshaft
lubrication
oil
is fed
through
oil passages
in
the
cylinder
head. Clean
the
oi
l passages
before
assembling
the
cylinder
head
.
Be
careful
not
to
damage
the
mating
surfaces
when
removing
the
cylinder
head cover
and
cylinder
head.
SPECIFICATIONS
valve guide
"
I .
TORQUE VALUES
Cylinder head
cover
bolt
Camshaft
holder
mounting
bolt
Decompressor
cam
mounting
bolt
('05 - '07)
Cam sprocket
bolt
Decompressor lifter
arm
mounting
nut
(,OS
- '07)
Cylinder head
nut
Cam chain
tensioner
bolt
Crankshaft hole cap
Engine
mounting
nut
Engine hanger plate
bolt
Spark
plug
(upper)
EX
17.9 - 18.1
(0.70-0.71)
10
N·m
(1.0
kgf·m,
7 Ibf.ft)
14
N·m
(1.4
kgf.m
,
10
Ibf·ft)
24
N·m
(2.4
kgf·m,
18 Ibf·ft)
20
N'm
(2.0
kgf·m,
15 Ibf·ft)
22
N·m (2.2
kgf·m,
16Ibf.ft)
66
N·m
(6.7
kgf·m,
49 Ibf.ft)
12
N·m
(1.2
kgf.m
,
9Ibf
·ft)
15
N·m
(1.5
kgf·m
,
11
Ibf·ft)
54
N·m
(5.5
kgf·m,
40 Ibf·ft)
26
N·m
(2.7
kgf·m
,
19
Ibf·ft)
22
N·m
(2.2
kgf·m
,
16Ibf·ft)
Apply
oil
to
the
threads
Apply
oil
to
the
threads
Apply
locking agent
to
the
th
reads
Apply
oil
to
the
threads
and seating surface
Apply
oil
to
the
threads
and
seating
surface
Apply
loC\C::ing
agent
to
the
threads
Apply
grease
to
the
threads
9-3

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Honda CRF450X 2010 Specifications

General IconGeneral
Engine Type449cc liquid-cooled single-cylinder four-stroke
Bore and Stroke96mm x 62.1mm
Compression Ratio12.0:1
TransmissionWide-ratio five-speed
Final Drive#520 chain; 13T/51T
Front Suspension47mm inverted Showa cartridge fork with 16-position rebound and 16-position compression damping adjustability; 12.4 inches travel
Front BrakeSingle 240mm disc with twin-piston caliper
Rear BrakeSingle 240mm disc
Front Tire80/100-21
Rear Tire110/100-18
Wheelbase58.3 inches
Fuel Capacity1.9 gallons
IgnitionSolid-state CD with electronic advance
Rear SuspensionPro-Link Showa single shock with spring preload, 17-position rebound damping adjustability, and 13-position compression damping adjustability; 12.4 inches travel
Rake27.38 degrees

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