18
IMPORTANT: The engines covered in this manual (Except 3.0L)
are equipped with an RPM rev-limiter that is set to an upper (or
limited) RPM amount. This limit is slightly above the normal
operating range of the engine and is designed to help prevent
damage from excessive engine RPM. Once the RPM drops into
the recommended operating RPM range normal engine
operation resumes.
Select a propeller that will allow the engine power package to operate
at or near the top end of the recommended wide-open-throttle
operating RPM range with a normal load. High RPM, caused by an
excessive trim angle, should not be used in determining correct
propeller selection.
If full throttle operation is below the recommended range, the
propeller must be changed to prevent loss of performance and
possible engine damage. On the other hand, operating an engine
above the recommended operating RPM range will cause higher
than normal wear and/or damage. Generally, there is a 200-300 RPM
change between propeller pitches.
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.
• Operating in a higher elevation causes an RPM loss.
• Operating with a damaged propeller or dirty boat bottom causes
an RPM loss.
• Operating with increased load (additional passengers, pulling
skiers, etc.).
For better acceleration, such as is needed for water skiing, use the
next lower pitch propeller. However, do not operate at full throttle
when using the lower pitch propeller but not pulling skiers.
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