I have a Tracker V16 Guide w/15HP OB. I use it primarily in brackish river water and edges of the Chesapeake bay. However I have wanted to take up some fresh water fishing and its is limited to a 9hp or less or electric. I was given a Johnson 9.9 that ran when put away over 10 years ago (Project). My main question is "Do you remove the OB when using trolling motor as primary? I have a bow mounted trolling motor and was thinking of getting one for the stern on electric only but the OB is bolted on through the transom and removing it will be a pain. Any issues with leaving it on other than weight and drag? Thanks