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Mercury 2.5 Service Manual

Mercury 2.5
45 pages
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TROUBLESHOOTING
39
Engine Will Not Start
POSSIBLE CAUSES
Incorrect starting procedure. Refer to Operation section.
Old or contaminated gasoline.
Engine flooded. Refer to Operation section.
Fuel is not reaching the engine.
a. Fuel tank is empty.
b. Fuel tank vent not open or restricted.
c. Fuel shut-off valve closed
d. Fuel tank filter obstructed.
Ignition system component failure.
Spark plug fouled or defective. Refer to Maintenance section.
Carburetor inlet needle stuck from contaminated gasoline.
Engine Runs Erratically
POSSIBLE CAUSES
Spark plug fouled or defective. Refer to Maintenance section.
Fuel is being restricted to the engine.
a. Fuel tank vent not open or restricted.
b. Fuel tank filter obstructed.
Ignition system component failure.
Performance Loss
POSSIBLE CAUSES
Damaged or improper size propeller.
Boat overloaded or load improperly distributed.
Excessive water in bilge.
Boat bottom is dirty or damaged.

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Mercury 2.5 Specifications

General IconGeneral
Fuel Induction SystemCarburetor
IgnitionCDI
StartingManual
SteeringTiller
Cylinders1
Recommended Fuel87 Octane
Shaft Length15 in (381 mm)
Horsepower2.5 HP
Gear ShiftForward, Neutral

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