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Troubleshooting
Tips 145
The items that are serviceable using this Manual
are followed by the page number reference in
parenthesis. The items that require use of an
official Honda Service Manual are followed by
an asterisk (*).
ENGINE DOES NOT START OR IS HARD TO START
CHECK POSSIBLE CAUSES
6. Start by following
normal starting
procedure
ENGINE STARTS
BUT SOON
STOPS
2. Try spark test
*
GOOD SPARK
WEAK OR NO
SPARK
INCORRECT
5. Test cylinder
compression
*
CORRECT
LOW
1. Check the spark plug
condition (P.67)
CORRECT
• Incorrect spark plug
heat range
• Incorrect spark plug gap
• Dirty air cleaner element
• Faulty spark plug (P.67)
• Fouled spark plug (P.67)
• Faulty ECM
*
• Broken or shorted spark
plug wire
• Faulty alternator
*
• Faulty ignition coil
*
• Faulty engine stop
button
*
• Loose or disconnected
ignition system wires
• Faulty CKP sensor
*
• Faulty regulator/rectifier
*
• Faulty condenser
*
• Valve clearance too
small
• Valve stuck open
• Worn cylinder and piston
ring
*
• Damaged cylinder head
gasket
• Improper valve timing
*
• Seized valve
• Insulator leaking
• Improper ignition timing
(Faulty ECM or CKP
sensor)
*
• Fast idle knob stuck
open or damaged
• Fuel contaminated
INCORRECT
3. Check the PGM-FI
system (P.7)
CORRECT
• Faulty PGM-FI system
(P.9)
INCORRECT
4. Check the fuel
pump operation
and inspect the fuel
flow
*
CORRECT
• Faulty fuel pump
*
• Clogged fuel pump filter
(P.44)
ENGINE LACKS POWER
CHECK POSSIBLE CAUSES
1. Check the wheel
spin smoothly
CORRECT
INCORRECT
• Brake dragging
• Worn or damaged
wheel bearings
• Bent axle shaft
• Drive chain too tight
• Faulty valve core
• Punctured tire
• Clutch slipping
• Improperly adjusted
clutch lever freeplay
(P.62)
• Worn clutch discs/plates
(P.65)
• Warped clutch
discs/plates (P.65)
• Weak clutch springs
(P.66)
• Sticking clutch lifter
• Additive in engine oil
• Dirty air cleaner element
• Clogged muffler
• Fast idle knob stuck
open or damaged
• Restricted fuel fill cap
breather tube
• Restricted fuel flow
• Worn piston and
cylinder
*
• Use of poor quality fuel
• Excessive carbon build-
up in combustion
chamber
• Ignition timing too
advance (Faulty ECM)
*
• Lean fuel mixture
• Faulty ECM
*
• Faulty CKP sensor
*
2. Check the tire
pressure (P.95)
CORRECT
INCORRECT
NO
3. Check the engine
speed change
accordingly when
clutch is engaged
*
GOOD
NO GOOD
4. Check the engine
speed increase
GOOD
NO GOOD
6. Check the
ignition timing
*
CORRECT
INCORRECT
5. Check the engine
knocking when
accelerate or run
the engine at high
speed
YES
7. Test cylinder
compression
*
CORRECT
LOW
• Valve clearance too
small
• Valve stuck open
• Worn cylinder and
piston ring
*
• Damaged cylinder head
gasket
• Improper valve timing
*
• Faulty decompressor
system
*
INCORRECT
9. Check the fuel
pump operation
and inspect the
fuel flow
*
CORRECT
• Faulty fuel pump unit
*
• Clogged fuel pump filter
(P.44)
8. Check the PGM-FI
system (P.7)
• Faulty PGM-FI system
(P.9)
INCORRECT
CORRECT
• Incorrect spark plug
• Incorrect spark plug gap
• Dirty air cleaner
element
10. Check the spark
plug condition
(P.67)
INCORRECT
CORRECT
• Engine oil level too high
• Engine oil level too low
• Contaminated engine
oil
11. Check the engine
oil level and
condition (P.50)
INCORRECT
CORRECT
• Faulty oil pump
*
• Faulty pressure relief
valve
*
• Clogged oil passage
*
• Clogged oil strainer
screen
*
12. Remove the
cylinder head
cover and inspect
lubrication
INCORRECT
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