Mercury 90 Manual

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90-10122R30
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INSTALLATION
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INSTALLING OUTBOARD
WARNING
Before operation, the outboard must be correctly installed with four
mounting bolts shown. Failure to correctly fasten outboard could result
in outboard ejecting off boat transom causing serious injury, death, or
property damage.
We strongly recommend that your dealer install your outboard and related
accessories to ensure proper installation and good performance. If you install the
outboard yourself, follow instructions in the Outboard Installation Manual which is
provided with the outboard.
The outboard must be secured to the transom with the four 1/2 inch diameter
mounting bolts and locknuts provided with the outboard. Install two bolts thru the
upper set of holes and two bolts thru the lower set of holes.
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PROPELLER SELECTION
For best all around performance from your outboard/boat combination, select a
propeller that allows the engine to operate in the upper half of the recommended
full throttle RPM range with the boat normally loaded (refer to Specifications). This
RPM range allows for better acceleration while maintaining maximum boat speed.
If changing conditions cause the RPM to drop below the recommended range
(such as warmer, more humid weather, operation at higher elevations, increased
boat load, or a dirty boat bottom/gear case) a propeller change or cleaning may
be required to maintain performance and ensure the outboards durability.
Check full-throttle RPM using an accurate tachometer with the engine trimmed out
to a balanced-steering condition (steering effort equal in both directions) without
causing the propeller to “break loose.”
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TRANSPORTING
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TRAILERING BOAT/OUTBOARD
Trailer your boat with the outboard tilted down (vertical operating position).
If additional ground clearance is required, the outboard should be tilted up using
an accessory outboard support device. Refer to your local dealer for
recommendations. Additional clearance may be required for railroad crossings,
driveways and trailer bouncing.
IMPORTANT: Do not rely on the power trim/tilt system or tilt support lever
to maintain proper ground clearance for trailering. The outboard tilt support
lever is not intended to support the outboard for trailering.
Shift the outboard to forward gear. This prevents the propeller from spinning freely.
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FUEL & OIL
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GASOLINE RECOMMENDATIONS
United States and Canada
Use a major brand of automotive unleaded gasoline with a minimum posted octane
rating of 87. Mid-grade automotive gasolines that contain fuel injector cleaner are
preferred for added internal engine cleanliness. Leaded gasoline is not
recommended.
International
Use a major brand of automotive unleaded gasoline with a minimum posted octane
rating of 90RON. Automotive gasolines that contain fuel injector cleaner are
preferred for added internal engine cleanliness. Leaded gasoline is acceptable in
areas where unleaded gasoline is not available.
Alcohol in Gasoline
We do not recommend the use of gasoline which contains alcohol because of the
possible adverse effect the alcohol may have on the fuel system. In general, if only
gasoline containing alcohol is available, it must not contain more than 10% ethanol
or 5% methanol, and the addition of a Water Separating Fuel Filter is
recommended.
If gasoline containing alcohol is used or if you suspect the presence of alcohol in
your gasoline, increase your inspection of the fuel system, visually checking for
fuel leaks or abnormalities.
Gasoline containing alcohol may cause the following problems to your outboard
and fuel system:
• Corrosion of metal parts.
• Deterioration of elastomers and plastic parts.
• Wear and damage of internal engine parts.
• Starting and operating difficulties.
• Vapor lock or fuel starvation.
Some of these adverse effects are due to the tendency of gasoline containing
alcohol to absorb moisture from the air, resulting in a phase of water and alcohol
which separates from the gasoline in the fuel tank.
The adverse effects of alcohol are more severe with methanol and are worse with
increasing content of alcohol.

Mercury 90 Specifications

General

Brand	Mercury
Model	90
Category	Outboard Motor
Language	English