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Troubleshooting
Tips
131
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
(
*).
ENGINE DOES NOT START OR IS HARD TO START
CHECK POSSIBLE CAUSES
1. Check the fuel flow
to carburetor
• No fuel in fuel tank
• Clogged fuel line or fuel
filter (P.34)
• Sticking float valve
*
• Clogged fuel fill cap
breather tube
2. Try spark test
*
• 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
*
• 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
• 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)
5. Remove and
inspect spark plug
• Carburetor flooded
• Choke closed
• Throttle valve open
• Air cleaner dirty (P. 43)
6. START WITH CHOKE ON
REACHING
CARBURETOR
NOT
REACHING
CARBURETOR
GOOD SPARK
WEAK OR
NO SPARK
NORMAL
LOW
ENGINE DOES
NOT FIRE
ENGINE
STARTS
BUT SOON
STOPS
DRY
WET PLUG
POOR PERFORMANCE AT LOW AND UNSTABLE
IDLE SPEED
CHECK POSSIBLE CAUSES
1. Check if air cleaner
is overoiled (P.43)
• Over-oiled air cleaner
2. Check if the
connecting tube
and/or insulator is
leaking
• Loose connecting tube
and/or insulator band
• Damaged connecting
tube and/or insulator
3. Check carburetor
pilot screw
adjustment
• Fuel-air mixture too lean
(Turn the pilot screw out)
(P.120)
• Fuel-air mixture too rich
(Turn the pilot screw in)
(P. 120)
4. Check carburetor
jets and accelerator
pump for clogs
• Contaminants in the fuel
• Not cleaned frequently
enough (P.112)
5. Try spark test • 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
*
6. Check the throttle
position sensor
*
• Faulty throttle position
sensor
*
7. Test cylinder
compression
*
•Ring worn
• Cylinder worn or
damaged
*
• Piston worn or damaged
*
• Head gasket not sealing
• Valve stuck open
CORRECT
INCORRECT
NOT LEAKING
LEAKING
CORRECT
INCORRECT
NOT CLOGGED
CLOGGED
GOOD SPARK
WEAK OR
I
NTERMITTENT
SPARK
CORRECT
INCORRECT
CORRECT
LOW
POOR PERFORMANCE AT HIGH SPEED
CHECK POSSIBLE CAUSES
1. Disconnect fuel line
at carburetor and
check for clogging
(P.34)
• 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)
2. Remove air cleaner
(P.43)
• Not cleaned frequently
enough (P.43)
3. Install a larger
carburetor main jet
(P. 117)
• Jet size wrong, rejet in the
opposite direction (P.120)
4. Check carburetor
jets for clogging
• Contaminants in the fuel
5. Check valve timing • Cam sprocket not
installed properly
6. Try spark test • 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
*
7. Test cylinder
compression
*
•Ring worn
• Cylinder worn or
damaged
• Piston worn or damaged
• Head gasket not sealing
• Valve stuck open
UNRESTRICTED
FUEL FLOW
FUEL FLOW
RESTRICTED
AIR FILTER
NOT DIRTY
DIRTY
CORRECT
CONDITION
WORSE
NOT CLOGGED
CLOGGED
CORRECT
INCORRECT
GOOD SPARK
WEAK OR
INTERMITTENT
SPARK
CORRECT
LOW
31KSE7100_NA.book 131 ページ ２０１９年４月９日 火曜日 午後１時１３分
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