Brunswick Boston Whaler 21 Guardian Series, Operation & Maintenance Manual

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2-16
Section 2 Boat Operation
Propellers
Your outboard engine is equipped with a propeller of a
tested size and design to provide best engine and boat
performance.
Refer to the engine operator’s manual for detailed
information about propeller designs and the correct
propeller selection method.
You should always carry a spare propeller, propeller
hardware, and propeller wrench on-board. Universal
propeller wrench P/N 1964627 is available from Bos-
ton Whaler. You should replace your propeller when it
becomes damaged to avoid additional damage to the
engine.
In some situations, you might want to change the pro-
peller to give your boat slightly different performance
characteristics. Changes to your boat’s configuration,
such as additional equipment or adding bottom paint,
can affect the type and size of the propeller required.
!
CAUTION
Never use a propeller that allows the engine to
operate outside of its recommended RPM range
at full throttle. Extensive engine damage can
occur.
!
WARNING
To prevent the engine from starting acciden-
tally, turn the engine battery OFF-ON switch to
the OFF position before changing a propeller.