Propeller Selection - Mercury 60 Operation, Maintenance & Installation Manual

ENGINE INSTALLATION
The outboard must be secured to the transom with the four 12.7 mm (1/2 in.)
diameter mounting bolts and locknuts provided. Install two bolts through the
upper set of holes and two bolts through 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
General Information ‑ Specifications). This RPM range allows for better
acceleration while maintaining maximum boat speed.
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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/gearcase), 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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