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Mercury 300XS OptiMax User Manual

Mercury 300XS OptiMax
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MAINTENANCE
76
1. Remove the spark plug leads. Twist the rubber boots slightly
and pull off.
ob00375
2. Remove the spark plugs to inspect. Replace spark plug if
electrode is worn or the insulator is rough, cracked, broken,
blistered or fouled.
3. Set the spark plug gap to specifications.
ob00680
Spark Plug Gap 0.81 mm (0.032 in.)
4. Before installing spark plugs, clean off any dirt on the spark
plug seats. Install plugs finger tight, and then tighten 1/4 turn
or torque to specifications.
Description Nm lb. in. lb. ft.
Spark plug 27 20
Battery Inspection
The battery should be inspected at periodic intervals to ensure
proper engine starting capability.
IMPORTANT: Read the safety and maintenance instructions
which accompany your battery.
1. Turn off the engine before servicing the battery.
2. Add water as necessary to keep the battery full.
3. Make sure the battery is secure against movement.
4. Battery cable terminals should be clean, tight, and correctly
installed. Positive to positive and negative to negative.

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Mercury 300XS OptiMax Specifications

General IconGeneral
Engine Type2-Stroke
Horsepower300 HP
Alternator Output60 amp / 756 watt
Gear Ratio1.75:1
Starting SystemElectric
Fuel System2-Stage Direct Fuel Injection (DFI)
Weight505 lbs / 229 kg
Cylinders6
SteeringHydraulic
Shaft Length25"

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