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Trouble type Possible reason Recovery action
Engine power loss
Propeller is damaged Repair or replace propeller
Trim angle is incorrect
Adjust trim angle to achieve most efficient
operation
Motor is mounted at incorrect transom
height
Adjust motor to proper transom height
Boat bottom is fouled with marine growth Clean boat bottom
Weeds or other foreign matter are tangled
on gear housing
Remove foreign matter and clean lower
unit
Spark plug(s) are fouled or incorrect type
Inspect spark plug(s). Clean or replace
with recommended type
Fuel system is obstructed
Check for pinched or kinked fuel line or
other obstructions in fuel system
Fuel filter is clogged Clean or replace with recommended type
Fuel is contaminated or stale Fill tank with clean, fresh fuel
Spark plug gap is incorrect Inspect and adjust as specified
Ignition wiring is damaged or poorly
connected
Check wires for wear or breaks. Tighten all
loose connections. Replace worn or broken
wires
Ignition parts have failed Have serviced by your dealer
Specified engine oil is not being used Check and replace oil as specified
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