9-2
Troubleshooting
O
K
4st 2/2.5/3.5 2007
1.Troubleshooting List
○
○
Fuel level is low in the tank.
○
○
○
○
○
○
○
Fuel system connection is incomplete.
○
○
○
○
○
○
○
Fuel pipe is twisted.
○
○
○
○
○
○
○
Air vent screw is closed.
○
○
○
○
○
○
○
Fuel cock or carburetor is clogged.
○
○
○
○
○
○
○
Low quality gasoline
○
○
○
○
Fuel is fed excessively.
○
○
○
○
○
○
○
Carburetor is maintained poorly.
○
○
○
○
○
Engine oil is deteriorated.
○
○
○
○
Engine oil level is too high.
○
○
Engine oil lacks.
○
○
○
○
○
○
○
Use of spark plugs not specified
○
○
○
○
○
○
Spark plug carbon deposit or bridge
○
○
○
○
○
○
No sparks or weak spark
○
Stop switch short-circuited
○
Stop switch lock is not in place.
○
○
○
○
○
○
Ignition timing is not properly adjusted.
○
○
○
○
○
○
Valve timing is wrong.
○
○
○
○
○
○
Valve clearance is wrong.
○
○
○
○
○
○
Valve seat sealing is defective.
○
○
○
○
○
○
Piston, piston ring and/or cylinder is worn excessively.
○
○
Combustion chamber excessive carbon deposits.
○
○
○
○
Spark plug is loose.
○
○
○
(Cooling water is lacking.) Water pump is defective or clogged.
○
○
○
Thermostat operation is defective.
○
○
○
○
Anti-cavitation plate is damaged.
○
○
○
○
○
Use of mismatched propeller.
○
○
○
○
○
○
Propeller is damaged or deformed.
○
○
○
○
○
Thrust rod position is not correct.
○
○
○
○
○
Boat is unbalanced by load position.
○
○
○
○
○
Transom installation height is too high or too low.
○
○
○
○
○
○
Throttle link adjustment is defective.
Engine
will
not
s
tart.
Fuel
&
Lubrication
S
ystem
Ignition
System
Compression
O
thers
Engine
stalls
immediately
after
starting.
Idles
a
bnormally.
Defective
a
cceleration.
Engine
speed
is
very
high
causing
high
speed
ESG
to
operate.
Boat
cannot
run
a
t
h
igh
speed.
Engine
speed
is
low.
Engine
overheats.
Probable Cause
MFS2̲sec09̲070524.qxd 07.5.24 3:23 PM ページ 2
