GENERAL INFORMATION
90-857138R1 MAY 2000 Page 1C-7
Propeller Selection
For in-depth information on marine propellers and boat performance - written by marine en-
gineers - see your Authorized Dealer for the illustrated “What You Should Know About
Quicksilver Propellers...and Boat Performance Information” (Part No. 90-86144).
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 ac-
celeration while maintaining maximum boat speed.
If changing conditions cause the rpm to drop below the recommended range (such as warm-
er, 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 bal-
anced-steering condition (steering effort equal in both directions) without causing the pro-
peller 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 maxi-
mum 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 skiers,
etc.).
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