Prestarting Check List - Mercury 4 TwoStroke Operation, Maintenance And Installation Manual

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Prestarting Check List

Operator knows safe navigation, boating, and operating procedures.
An approved personal flotation device of suitable size for each person
aboard and readily accessible (it is the law).
A ring type life buoy or buoyant cushion designed to be thrown to a
person in the water.
Know your boats' maximum load capacity. Look at the boat capacity plate.
Fuel supply OK.
Arrange passengers and load in the boat so the weight is distributed
evenly and everyone is seated in a proper seat.
Tell someone where you are going and when you expect to return.
It is illegal to operate a boat while under the influence of alcohol or drugs.
Know the waters and area you will be boating; tides, currents, sand bars,
rocks, and other hazards.
Make inspection checks listed in Maintenance ‑ Inspection and
Maintenance Schedule.
Operating in Freezing Temperatures
When using your outboard or having your outboard moored in freezing or near
freezing temperatures, keep the outboard tilted down at all times so the
gearcase is submerged. This prevents the trapped water in the gearcase from
freezing and causing possible damage to the water pump and other
components.
If there is a chance of ice forming on the water, the outboard should be
removed and drained completely of water. If ice should form at the water level
inside the outboard driveshaft housing, it will block water flow to the engine
causing possible damage.
Operating at High Elevations
IMPORTANT: To prevent serious damage to the engine caused by a lean fuel
mixture, do not operate the outboard (if the jets were changed for high
elevation) at a lower elevation unless the jets are changed again to correspond
to the new elevation.
Operating the outboard at an elevation higher than 762 m (2500 ft.) above sea
level may require a carburetor jet change. Consult your dealer. This will reduce
the normal performance loss experienced as a result of reduced oxygen in the
air causing an overly rich fuel mixture.
Operating in Saltwater or Polluted Water
We recommend that you flush the internal water passages of your outboard
with fresh water after each use in salt or polluted water. This will prevent a
buildup of deposits from clogging the water passages. Refer to Maintenance ‑
Flushing the Cooling System.
OPERATION
30
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