Check your manual for your motor's Wide-Open-Throttle(WOT) RPM range. At WOT your boat should ideally be running at the upper end of the range for maximum performance. Water sports or extra people on board may require a drop in pitch to meet the WOT RPM requirements.
Quick Pick Propeller Guide:
According to your manual's recommended WOT RPM range for your motor.....
- RPM's too high? (Move up in pitch)
- RPM's too low? (Move down in pitch)
- RPM's just right? (Stay with the same pitch)
Note: For every 2" of pitch will raise or lower your RPM's by 400(approx).