Mercury 305 CID - Improper Full Throttle Engine RPM; RPM too High; RPM too Low

1C-6 - TROUBLESHOOTING 90-823225--1 1096
Improper Full Throttle Engine RPM
RPM Too High
Cause Special Information
Propeller
Damaged; pitch too low; diameter too small;
propeller hub slipping.
Boat
Water pickup or thru hull fittings mounted too
close to propeller (ventilation); keel located too
close to propeller and/or too deep in the water
(ventilation). Drive installed too high on
transom; wrong gear ratio.
Operation
Unit trimmed out too far
Engine coupler slipping
Unit
trimmed
out
too
far
.
RPM Too Low
Cause Special Information
Propeller Damaged; pitch too great; diameter too great.
Boat
Dirty or damaged bottom; permanent or power
hook in bottom; false bottom full of water. Drive
installed too low on transom; wrong gear ratio.
Operation Unit trimmed in too far.