Propeller Selection - Mercury 300 - PRO MAX 3.0L User Manual

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GENERAL INFORMATION

Propeller Selection

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).
If changing conditions (such as warmer, more humid weather, oper-
ation at higher elevations, increased boat load, or a dirty boat bot-
tom/gear case) cause the RPM to drop below the recommended
range a propeller change or boat cleaning may be required.
Check full-throttle RPM using an accurate tachometer with the en-
gine trimmed out to a balanced-steering condition (steering effort
equal in both directions) without causing the propeller to "break
loose."
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