Loading ...
Loading ...
Loading ...
152 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 Service 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
WEAK OR
INTERMITTENT
SPARK
CORRECT
CORRECT
NOT LEAKING
NOT CLOGGED
GOOD SPARK
2. Check if the
connecting tube
and/or insulator
is leaking
3. Check carburetor
pilot screw
adjustment
*
4. Check carburetor
jets and accelerator
pump for clogs
5. Try spark test
*
6. Check the throttle
position sensor
*
CORRECT
7. Test cylinder
compression
*
• Over-oiled air cleaner
• Loose connecting
tube and/or insulator
band
• Damaged connecting
tube and/or insulator
• Improper pilot screw
adjustment
*
•
Contaminants in the fuel
• Not cleaned
frequently enough
(P.137)
• Faulty throttle position
sensor
*
• Ring worn
• Cylinder worn or
damaged
*
• Piston worn or
damaged
*
• Head gasket not
sealing
• Valve stuck open
•
Faulty, carbon or wet
fouled spark plug (P.61)
• Faulty ignition control
module
*
• Faulty exciter coil
*
• Faulty ignition coil
*
• Broken or shorted
spark plug wire
• Faulty ignition pulse
generator
*
•
Loose or disconnected
ignition system wires
• Faulty engine stop
button
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 line 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
*
CORRECT
• Valve stuck open
• Worn cylinder and
piston ring
*
• Leaking/damaged
cylinder head gasket
• Improper valve timing
*
• 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 CLEANER
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 carburetor
jets for clogging
4. Check valve
timing
5. Try spark test
*
6. Test cylinder
compression
*
• Contaminants in
the fuel
• Cam sprocket not
installed properly
• Faulty, carbon or wet
fouled spark plug
(P.61)
• Faulty ignition control
module
*
• Faulty exciter coil
*
• Faulty ignition coil
*
• Broken or shorted
spark plug wire
• Faulty ignition pulse
generator
*
• Loose or
disconnected
ignition system wires
• Faulty engine stop
button
• Ring worn
• Cylinder worn or
damaged
*
• Piston worn or
damaged
*
• Head gasket not
sealing
• Improper valve
timing
*
• Valve stuck open
Loading ...
Loading ...
Loading ...