I've been running a Gamefisher/Tanaka 3.0 HP for over 20 years....very simple and dependable motor. If it runs a bit and cuts off then it's a fuel/tank venting or fuel delivery problem...very easy to inspect and repair....these motors are still for sale on EBAy and similar...an extra motor might come in handy for parts, if you can buy one cheap that's not running. I use mine on a 17 foot aluminum canoe....lightweight(25lbs.), Centrifugal clutch is great for shallow water and air cooled so no water pump to worry about. Honda makes a very similar little motor about 3.5 HP new for about $1100 if you want something newer....