2005 Yamaha F90TR 90HP Outboards Factory Service Manual, Page 9Get this manual
GEN INFO Identification
Applicable model
General information
Propeller selection
This manual covers the following modelApplicable model F90TR
Serial number
The outboard motor serial number is stamped on label attached to the port clamp bracket
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