I have been looking for a trolling motor, I thought a 4 to 6hp would be enough for my 17' seaswirl I/O 4.3l. I don't plan on any river fishing just lakes. I want a 4 stroke so I can use the main tank and not worry about the extra gas can. I had a dealer tell me I needed at least 8hp. I just remember fishing with my dad, 20' searay with a 7.5 merc. It was plenty big still had to use a trolling anchor.<br /><br />Thanks for your help.<br />Steve