Honda CRF450X 2005 Service Manual page 458

Motorcycle
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TROUBLESHOOTING
22-4
7.
Cylinder
compression
Inspection
Test
the
cylinder compression.
Is
the compression
lowl
YES
_
.
Valve clearance
too small
Valve stuck open
Worn
cylinder and
pisto
n
rings
Damaged
cylinder
head ga sket
Improper
valve
timing
Faulty
decompressor
system
'05
-
'07:
Fa ulty
decompressor
cam
After '07:
Faulty
decompressor
shaft
NO
-
GO
TO
STEP
8.
8.
Carburetor
Inspection
Check
carburetor for
clogs.
Is the
carburetor
for
clogged?
YES
_
.
Ca
rbur etor
not
serviced
frequently enough
Ca
rburetor
dirty
Dirt
getting
past ai
r
cleaner
NO
-
GO
TO
STEP
9.
9.
Spark Plug Inspection
Remove
and inspect
spark
plug.
Is the
spark
plug fouled or
discolored?
YES
_
.
Plug not
serviced
frequently
enough
Incorrect spa
rk
plug
heat
range
Incorrect
spark
plug gap
NO
-
GO
TO
STEP
10.
10.
Engine Oil Inspection
Check
oil
level and condition.
Is the level
correct lind
good
condition?
NO
_
.
Oil
level
too
high
Oil level
too
low
Contaminated oil
YES
-
GO TO
STEP 11.
11
.
Over Heating Inspection
Check engi ne
overheating
.
Is the
engine overheating?
YES
-
.
Coolant level
too low
Excessive
carbon build-up
in
combustion
chamber
Use
of poor
quality
fuse
Clutch slipping
NO
-
GO
TO
STEP 12.
12.
lubrication Inspection
Remove
cylinder
head
cover and
inspect
lubrication.
Is the valve train lubricated
properly?
NO
_.
Fau lty oil
pump
Fau lty pressure
relief
valve
Clogged oil passage
Clogged oil strainer
YES
-
Valve
train
lubrication is
normal.

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