4-2
Outboard motor troubleshooting
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Symptom 1: Unstable engine idle speed, poor acceleration, poor performance, limited engine
speed, or engine stalls.
Symptom 1: High engine idle speed.
Symptom 1: Engine overheats.
Compression pressure
is low
Compression leakage Measure the compression pressure. 7-1
Check the valve for bends or stuck. 7-27
Check the decompressor for proper
operation.
7-44
Check the piston and piston ring for
damage.
7-41
Check the cylinder for damage. 7-41
Improper valve timing Check the valve timing. 7-37
Symptom 2 Cause Checking step
See
page
Fuel not supplied — Check that the air vent screw is open. —
Throttle valve does not
move properly
Carburetor malfunction Check the throttle valve for proper move-
ment.
6-18
Throttle link and throttle cable
not installed properly
Adjust the throttle link and throttle cable.
6-14
Spark is weak — Check the CDI unit air gap. 7-1
Improper fuel and air
amount supplied
Choke valve does not operate
properly
Check the choke valve operation.
—
Carburetor malfunction Adjust the pilot screw. 6-19
Disassemble and clean the carburetor. 6-18
Air leakage (carburetor to cylin-
der head)
Check the O-ring and gaskets of the car-
buretor and intake manifold.
6-10
Symptom 2 Cause Checking step
See
page
Improper fuel and air
amount supplied
Carburetor malfunction Adjust the pilot screw. 6-19
Disassemble and clean the carburetor. 6-18
Throttle link and throttle cable
not installed properly
Adjust the throttle link and throttle cable.
6-14
Symptom 2 Cause Checking step
See
page
Cooling water not dis-
charged from the cooling
water pilot hole
Clogged cooling water inlet Check the cooling water inlet. 10-7
Water pump impeller malfunc-
tion
Check the impeller. 8-6
Check the pin. 8-6
Water leakage from the water
pump housing
Check the insert cartridge. 8-6
Check the outer plate cartridge. 8-6
Check the water pump housing. 8-6
Leak or clogged cooling water
passage
Check the water pipe for damage and
proper installation.
9-9
Check the cooling water passage. 2-16
— Thermostat malfunction Check the thermostat. 7-35
Symptom 2 Cause Checking step
See
page
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