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Troubleshooting
Tips 131
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 (
*
).
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.34)
• Sticking float valve
*
• Clogged fuel fill cap
breather tube
• Faulty spark plug (P.52)
• Fouled spark plug (P.52)
• Faulty ignition control
module
*
• Broken or shorted direct
ignition coil wire
• Faulty exciter coil
*
• Broken or shorted direct
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
*
• 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 direct ignition coil
or ignition pulse
generator)
*
• Fuel contaminated
• Improper hot start
operation (P. 13)
WET PLUG
5. Remove and
inspect spark plug
DRY
• Carburetor flooded
• Choke closed
• Throttle valve open
• Air cleaner dirty (P. 43)
6. START WITH CHOKE ON
POOR PERFORMANCE AT LOW AND UNSTABLE
IDLE SPEED
CHECK POSSIBLE CAUSES
1. Check if air
cleaner is over-
oiled (P.43)
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
• Fuel-air mixture too
lean (Turn the pilot
screw out) (P.120)
• Fuel-air mixture too rich
(Turn the pilot screw in)
(P. 120)
• Contaminants in the
fuel
• Not cleaned frequently
enough (P.112)
• Faulty, carbon or wet
fouled spark plug (P.52)
• Faulty ignition control
module
*
• Faulty exciter coil
*
• Faulty engine stop
button
• Faulty direct ignition coil
*
• Broken or shorted
direct ignition coil wire
• Loose or disconnected
ignition system wires
• Faulty ignition pulse
generator
*
• Faulty throttle position
sensor
*
• Ring worn
• Cylinder worn or
damaged
*
• Piston worn or
damaged
*
• Head gasket not
sealing
• Valve stuck open
POOR PERFORMANCE AT HIGH SPEED
CHECK POSSIBLE CAUSES
1. Disconnect fuel
line at carburetor
and check for
clogging (P.34)
UNRESTRICTED
FUEL FLOW
FUEL FLOW
RESTRICTED
CONDITION
WORSE
DIRTY
2. Remove air
cleaner (P.43)
AIR FILTER
NOT DIRTY
• Lack of fuel in tank (P.34)
• Clogged fuel line (P.34)
• Clogged fuel fill
cap breather tube (P.34)
• Clogged fuel filter (P.35)
• Clogged fuel valve (P.34)
• Not cleaned
frequently enough
(P.43)
CLOGGED
INCORRECT
LOW
WEAK OR
INTERMITTENT
SPARK
NOT CLOGGED
CORRECT
CORRECT
GOOD SPARK
4. Check carburetor
jets for clogging
5. Check valve
timing
6. Try spark test
7. Test cylinder
compression
*
• Contaminants in
the fuel
CORRECT
3. Install a larger
carburetor main
jet (P. 117)
• Jet size wrong, rejet
in the opposite
direction (P.120)
• Cam sprocket not
installed properly
• Faulty, carbon or wet
fouled spark pulg
(P.52)
• Faulty ignition control
module
*
• Faulty exciter coil
*
• Faulty engine stop button
• Faulty direct ignition coil
*
• Broken or shorted
direct ignition coil wire
• Loose or disconnected
ignition system wires
• Faulty ignition pulse
generator
*
• Ring worn
• Cylinder worn or damaged
• Piston worn or damaged
• Head gasket not sealing
• Valve stuck open
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