S.G
GENERAL
WS019WS021
W5M,10481
[5]
TROUBLESHOOTING
Symptom
Probable Cause
Solution
Reference
Page
Engine
Will
Not
Crank
• Recoil starter
faulty
Repair
or
replace recoil
starter
-
• Engine jammed
Check engine
to
find
-
trouble
and repair
• Battery discharged
Charge
the
battery
•
Wiring
harness disconnected
Connect
M-13
• Starter defective
Repair or replace
5-101
• Starter switch defective
Repair or replace
5-99
Engine Cranks
• Increased resistance
of
moving
parts
Repair or replace
moving
-
Slowly
but
Does
Not
parts
Start
• Battery discharged
Charge
the
battery
• Excessively
high
viscosity
of
fuel or
Use
specified fuel
or
engine
5-3
engine oil
at
low
temperature
oil
Engine Cranks
at
• No fuel
Replenish fuel
5-29
Normal Speed
but
•
Air
in
fuel system
Bleed
air
-
Does
Not
Start
•
Water
in
fuel system Take
out
water
-
• Fuel pipe
or
fuel
filter
dogged
or
Clean
or
replace
5-35,5-41
damaged
• Compression leak from cylinder
Replace head gasket and
(Compression pressure
too
low)
tighten
cylinder head screw,
or
check cylinder
liner
and
piston ring
• Piston ring and cylinder
liner
worn
Replace piston
ring
and
5-77,5-81
cylinder
liner
5-83
• Improper valve clearance
Adjust valve clearance
5-51
• Defective
ignition
unit
Replace
ignition
unit
5-97
• Defective spark plug
Adjust spark
plug
gap
or
5-35
replace spark
plug
• Defective fuel system
Check fuel
line
and
5-93
carburetor, and repair
• Overchoking
Wipe
spark
plug
-
• Flooding
from
carburetor
Check carburetor and repair
5-93
• Clogged
air
cleaner
Clean
or
replace
air
cleaner
5-31
Rough
low-speed
• Defective
ignition
unit
Replace
ignition
unit
5-97
Running and
Idling
• Defective spark
plug
Adjust spark plug gap
or
5-35
replace spark
plug
• Incorrect
governor
adjustment
Adjust
governor
5-91
• Improper valve clearance
Adjust valve clearance
5-51
Rough High-speed
• Defective
ignition
unit
Replace
ignition
unit
5-97
Running
• Defective spark
plug
Adjust spark plug
gap
or
5-35
replace spark
plug
• Incorrect governor adjustment
Adjust governor
5-91
Engine Speed Does
• Defective
ignition
unit
Replace
ignition
unit
5-97
Not
Increase
• Incorrect carburetor adjustment
Adjust carburetor
low
Output
•
Improper
intake
or
exhaust valve
Repair valve seat
5-73,5-75
sealing
• Defective spark
plug
Adjust spark
plug
gap
or
5-35
replace spark
plug
•
Excessive
carbon
in
engine
Remove carbon
-
• Improper valve clearance
Adjust valve clearance
5-51
• Piston
ring
and cylinder
liner
worn
Replace piston
ring
and
5-77,5-81
cylinder
liner
5-83
S-5
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