146
Tips
Troubleshooting
The items that are serviceable using this Manual
are followed by the page number reference in
parenthesis. The items that require use of the
Honda Shop Manual are followed by an asterisk.
POOR PERFORMANCE AT LOW AND UNSTABLE
IDLE SPEED
CHECK
POSSIBLE CAUSES
1. Check if air
cleaner is over-
oiled (P.51)
CORRECT
INCORRECT
INCORRECT
LEAKING
CLOGGED
INCORRECT
LOW
WAKE OR
INTERMITTENT
SPARK
CORRECT
CORRECT
NOT LEAKING
NOT CLOGGED
GOOD SPARK
2. Check if the
connecting boot
is leaking
3. Check carbureator
pilot screw
adjustment
4. Check carburetor
jets and accelerator
pump for clogs
5. Try spark test
6. Check the throttle
position sensor*
CORRECT
7. Check for
low compression.
• Over-oiled air cleaner
• Loose insulator clamp
• Damaged insulator
• Improper pilot screw
adjustment*
• Contaminants in the
fuel
• Not cleaned frequently
enough (P.133)
• Faulty, carbon or wet
fouled spark pulg (P.61)
• Faulty ignition control
module*
• Faulty alternator*
• Faulty engine stop
button
• Faulty ignition coil*
• Broken or shorted
spark plug wire
• Faulty ignition pulse
generator*
• Faulty throttle position
sensor*
• Ring worn
• Cylinder worn or
damaged*
• Piston worn or
damaged*
• Head gasket not
sealing
ENGINE DOES NOT START OR IS HARD TO START
CHECK
POSSIBLE CAUSES
1. Check the fuel
flow to carburetor
REACHING
CARBURETOR
NOT REACHING
CARBURETOR
WEAK OR NO
SPARK
LOW
ENGINE STARTS
BUT SOON STOPS
2. Try spark test
GOOD SPARK
• No fuel in fuel tank
• Clogged fuel tube or
fuel filter (P.42)
• Sticking float valve*
• Clogged fuel fill cap
breather tube (P.41)
• Faulty spark plug (P.61)
• Fouled spark plug (P.61)
• Faulty ignition control
module*
• Broken or shorted spark
plug wire
• Faulty exciter coil
• Broken or shorted ignition
coil
• Faulty engine stop button
• Loose or disconnected
ignition system wires
• Faulty ignition pulse
generator*
3. Test cylinder
compression
NORMAL
• Valve stuck open
• Worn cylinder and piston
ring*
• Leaking/damaged
cylinder head gasket
• Improper valve timing*
• Improper decompressor
clearance (P.74)
• Seized valve
4. Start by following
normal starting
procedure
ENGINE DOES
NOT FIRE
• Improper choke operation
• Pilot screw incorrectly
adjusted*
• Insulator leaking
• Improper ignition timing
(Faulty ignition coil or
ignition pulse generator)*
• Fuel contaminated
• Improper hot start
operation (P.60)
WET PLUG
5. Remove and
inspect spark plug
DRY
• Carburetor flooded
• Choke closed
• Throttle valve open
• Air cleaner dirty (P.51)
6. START WITH CHOKE ON
POOR PERFORMANCE AT HIGH SPEED
CHECK
POSSIBLE CAUSES
1. Disconnect fuel
line at carburetor
and check for
clogging (P.41)
UNRESTRICTED
FUEL FLOW
FUEL FLOW
RESTRICTED
DIRTY
2. Remove air
cleaner (P.51)
AIR FILTER
NOT DIRTY
• Lack of fuel in tank
(P.41)
• Clogged fuel line
(P.41)
• Clogged fuel fill
cap breather tube
(P.41)
• Clogged fuel valve
(P.41)
• Clogged fuel filter
(P.42)
• Not cleaned
frequently enough
(P.51)
CLOGGED
INCORRECT
LOW
WEAK OR
INTERMITTENT
SPARK
NOT CLOGGED
CORRECT
CORRECT
GOOD SPARK
3. Check carbureator
jets for clogging
4. Check valve
timing
5. Try spark test
6. Check for
low compression.
• Contaminants in
the fuel
• Cam sprocket not
installed properly
• Faulty, carbon or wet
fouled spark pulg
(P.61)
• Faulty ignition control
module*
• Faulty alternator*
• Faulty engine stop button
• Faulty ignition coil*
• Broken or shorted
spark plug wire
• Faulty ignition pulse
generator*
• Ring worn
• Cylinder worn or
damaged*
• Piston worn or
damaged*
• Head gasket not
sealing
142-168.qxd 06.6.1 11:08 ページ146
Содержание CRF450X
Страница 3: ...Honda CRF450X OWNER S MANUAL COMPETITION HANDBOOK Contents qxd 06 6 1 10 56 ページ2 ...
Страница 12: ...6 Motorcycle Safety 001 030 qxd 06 6 1 10 57 ページ6 ...
Страница 18: ...12 Before Riding 001 030 qxd 06 6 1 10 57 ページ12 ...
Страница 28: ...22 Basic Operating Instructions 001 030 qxd 06 6 1 10 57 ページ22 ...
Страница 156: ...150 Taking Care of Unexpected 142 168 qxd 06 6 1 11 08 ページ150 ...
Страница 169: ...Technical Information 163 Wiring Diagram 142 168 qxd 06 6 1 11 08 ページ163 ...