GENERAL INFORMATION
Page 1C-6
90-826883R2 JUNE 1998
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 Specifications). This RPM range allows for
better acceleration while maintaining maximum boat speed.
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/gear case) a propeller change or cleaning may be required to maintain
performance and ensure the outboard’s 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”.
Refer to “Quicksilver Accessory Guide” for a complete list of available propellers.
1. Select a propeller that will allow the engine to operate at or near the top of the recom-
mended full throttle RPM range (listed in “Specifications,” preceding) with a normal
load. Maximum engine speed (RPM) for propeller selection exists when boat speed
is maximum and trim is minimum for that speed. (High RPM, caused by an excessive
trim angle, should not be used in determining correct propeller.) Normally, there is a
150-350 RPM change between propeller pitches.
2. If full throttle operation is below the recommended range, the propeller MUST BE
changed to one with a lower pitch to prevent loss of performance and possible engine
damage.
3. After initial propeller installation, the following common conditions may require that
the propeller be changed to a lower pitch:
a. Warmer weather and great humidity will cause an RPM loss.
b. Operating in a higher elevation causes an RPM loss.
c. Operating with a damaged propeller or a dirty boat bottom or gear housing will
cause an RPM loss.
d. Operation with an increased load (additional passengers, equipment, pulling ski-
ers, etc.).