1996 Johnson Evinrude "ED" 40 thru 55 2-Cylinder Service Manual, P/N 507124, Page 30Get this manual

1996 Johnson Evinrude "ED" 40 thru 55 2-Cylinder Service Manual, P/N 507124, Page 30

Propeller Selection Selecting the correct propeller for each engine and boat combination will ensure good engine service
to determine the engine's full -throttle RPM as you test various propellers Select propeller that suits the customer's 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 Specifications, this 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, the engine is operating below its normal range at full throttlepower is being lost, and powerhead damage
could occurIf the propeller blades have too little pitch, the engine is operating above its normal range at full throttle