Mercury SST120 User Manual page 54

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3
– ENGINE RUNS ERRATICALLY
POSSIBLE CAUSES
•
Spark plugs fouled or defective. Refer to Maintenance Section.
•
Incorrect setup and adjustments.
•
Fuel is being restricted to the engine.
a. Fuel tank filter obstructed.
b. Water separating filter or In-Line filter clogged.
c. Stuck anti-siphon valve on built in fuel tank.
d. Fuel line is kinked or pinched.
e. Reed valve open or broken.
•
Fuel pump failure.
•
Ignition system component failure.
4
– PERFORMANCE LOSS
POSSIBLE CAUSES
•
Throttle not opening fully.
•
Damaged or improper size propeller.
•
Incorrect engine timing, adjustments, or setup.
•
Boat overloaded or load improperly distributed.
•
Excessive water in bilge.
•
Boat bottom is dirty or damaged.
TROUBLESHOOTING
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