1995 Johnson/Evinrude Outboards 50 thru 70 3-cylinder Service Manual, Page 26Get this manual

1995 Johnson/Evinrude Outboards 50 thru 70 3-cylinder Service Manual, Page 26

Propeller Selection Selecting the correct propeller for each engine and boat combina tion will ensure good engine service
to determine the engine' full-throttle RPM as you test various propellers Select propeller that suits the customer' application
and allows the engine to run near the midpoint of the full throttle operating range when the boat has normal load in itRefer
to Engine Specificationsthis section To compensate for changes in boat loading, the engine's full throttle RPM must be verified
periodically Occasionally, one propeller will not cover wide range of boat applicationswater skiing to high speed performance
boatingIn such cases, it might be necessary to have propeller for each situation If the propeller blades have too much pitch,
he engine is operating below its normal range at full throttlepower is being lost, and powerhead damage could occurIf the
propeller blades have too little pitchthe engine is operating above its normal range at full throttle and damage from overspeeding