ON THE WATER
SECTION 3
Page 38 CMD-4081877 / 90-865861040 MARCH 2004
00000 was 0040 or CE464 w rev bar indicated changes
Propeller Selection
CAUTION
The installed propeller must allow the engine to run at the Rated Engine rpm at WOT
to avoid engine damage. Using a propeller that causes the engine to operate below
the Rated Engine rpm can cause piston and/or valve damage (even if the engine is
not operated at WOT). Conversely, using a propeller that allows engine to operate
above the specified Rated Engine rpm can increase fuel consumption and wear and
will not allow engine to produce its rated horsepower.
It is the responsibility of the boat manufacturer and/or the selling dealer to equip the power
package with the correct propellers.
IMPORTANT: The engines covered in this manual are equipped with an ECM that
limits engine rpm. Be sure that propeller being used does not allow engine to run
against the limiter, as a significant loss in performance will result.
NOTE: Use an accurate service tachometer to verify rpm.
Select a propeller that will allow the engine power package to operate at the Rated Engine
rpm with a full load.
If full throttle operation is below the Engine Rated rpm, the propeller must be changed to
prevent loss of performance and possible engine damage. On the other hand, operating an
engine above the Rated Engine rpm will cause higher than normal wear and/or damage.
After initial propeller selection, the following common problems may require that the
propeller be changed to a lower pitch:
• Warmer weather and greater humidity cause an rpm loss (not as significant on these
models).
• Operating in a higher elevation causes an rpm loss (not as significant on these models).
• Operating with a damaged propeller or dirty boat bottom causes an rpm loss.
• Operating with increased load (additional passengers, pulling skiers).
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