TROUBLESHOOTING SERVICE MANUAL NUMBER 22
Page 1C-6 90-860074--1 FEBRUARY 2002
Improper Full Throttle Engine RPM
RPM Too High
Cause Special Information
1. Operation 3. Unit trimmed out too far
2. Propeller 1. Damaged; pitch too low; diameter too
small; propeller hub slipping
3. Boat 2. A. Water pickup or accessories
mounted too close to propeller (venti-
lation)
B. Keel located too close to propeller
and/or too deep in the water (ventila-
tion)
C. Drive installed too high on transom
D. Wrong gear ratio
4. Engine coupler slipping
RPM Too Low
Cause Special Information
1. Operation 3. Unit trimmed in too far
2. Propeller 1. Damaged; pitch too great; diameter
too great
2. Boat 2. A. Dirty or damaged bottom
B. Permanent or power hook in bot-
tom
C. False bottom full of water
D. Drive installed too low
E. Excessive boat load
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