1994 Johnson/Evinrude Outboards 40 thru 55 Service Manual, Page 30Get this manual

1994 Johnson/Evinrude Outboards 40 thru 55 Service Manual, Page 30

Propeller Selection Selecting the correct propeller for each engine and boat combinat ion will ensure good engine service
tachometer 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