It will be the third season for my F150 and the manual suggests changing the impeller as routine maintenance. I hear from some that changing the impeller isn't really a big deal and was wondering if this schematic from yamaha is making things more complicated than I can expect. <br /> http://www.yamaha-motor.com/outboard/parts/home.aspx <br /><br />Finally, If I do have the dealer replace it, what can I expect as far as a fair cost?