Any suggestions on low HP motors that would be used for a smaller 14' Alumacraft that's rated for up to 7HP? I'd be using it every fall for duckhunting in MN, so weeds and cool temperatures are a serious considerations. Fishing on smaller waters would be a secondary use. Any that would not be good if purchased used? Functional in adverse conditions, but tolerable to run for a few hours will be the key for me (vs. PC in any discussion of 2- vs 4-stroke). Light would be good as would fuel economy, but not expecting to get it all since the boat it will go on isn't much and the whole rig will ultimately get abused as duck boats so often do...