Mercury SST120 - Owner Service Assistance; Dealer and Service Office Support

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TROUBLESHOOTING
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.