2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 15Get this manual
Special service toolPropeller selectionPredelivery check
Propeller selection
The performance of boat and outboard motor will be critically affected by the size and type of propeller you choosePropellers greatly affect boat speed, acceleration, engine life, fuel economy, and even boating and steering capabilitiesAn incorrect choice could adversely affect performance and could also seriously damage the engineUse the following information as guide for selecting propeller that meets the operating conditions of the boat and the outboard motor
a Propeller diameter (in inches) Propeller pitch (in inches) Propeller type (propeller mark)
Selection