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Mercury Optimax User Manual

Mercury Optimax
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TROUBLESHOOTING
84
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. Engine fuel filter is obstructed. Refer to Maintenance
section.
b. Fuel tank filter obstructed.
c. Stuck anti‑siphon valve on built in fuel tank.
d. Fuel line is kinked or pinched.
e. Injector plugged.
Threaded connection of an air hose is loose.
Fuel pump failure.
Ignition system component failure.
Performance Loss
POSSIBLE CAUSES
Throttle not fully open.
Damaged propeller or improper propeller size.
Boat overloaded or load improperly distributed.
Excessive water in bilge.
Boat bottom is dirty or damaged.
Battery Will Not Hold Charge
POSSIBLE CAUSES
Battery connections are loose or corroded.
Low electrolyte level in battery.
Worn out or inefficient battery.
Excessive use of electrical accessories.
Defective rectifier, alternator, or voltage regulator.
Open circuit in the alternator output wire (fused link).

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Mercury Optimax Specifications

General IconGeneral
StartingElectric
Engine Type2-Stroke
Fuel SystemDirect Fuel Injection (DFI)
DisplacementVaries by model (e.g., 1.5L, 1.7L, 2.5L, 3.0L)
Shaft Length20", 25"
Fuel Tank CapacityExternal
CylindersVaries by model (e.g., 3, 4, 6 cylinders)

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