Operating In Salt Water Or Polluted Water; Operating At High Elevations; Setting Trim Angle While Running Engine At Idle Speed - Mercury 200 OptiMax Manual

Operating In Salt Water 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.
If you keep your boat moored in the water, always tilt the outboard
so the gearcase is completely out of water (except in freezing
temperatures) when not in use.
Wash the outboard exterior and flush out the exhaust outlet of the
propeller and gearcase with fresh water after each use. Each
month, spray Mercury Precision or Quicksilver Corrosion Guard on
external metal surfaces. Do not spray on corrosion control anodes
as this will reduce the effectiveness of the anodes.

Operating at High Elevations

Your engine automatically compensates for high elevation
changes. A different pitch propeller may help reduce some normal
performance loss resulting from reduced oxygen in the air. Consult
your dealer.
Setting Trim Angle While Running Engine at Idle
Speed
Submerging the exhaust relief hole on the outboard can happen
on some boats if you trim full in while running at idle speed,
resulting in, exhaust restriction, rough idle, excessive smoke, and
fouled spark plugs. If this condition exists, trim outboard up until
exhaust relief hole is out of the water.
a
a - Relief hole submerged (wrong)
b - Relief hole above water line (correct)
OPERATION
b
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