On my M-17 I currently have a mid-80's 4hp 2-cycle Evinrude. Since the day I got it, I was unhappy with it. It keeps running rough despite having had it completely tuned up (new coils, new points, new impeller, new carburetor kit). Sometimes it will slowly die. And on top of everything it is rather noisy and seems to smoke a lot. I know all 2-cycles are somewhat like this, but on my previous boat I had a 50's vintage Johnson 3hp (all metal), which ran like a top with none of these problems. I would need some advice on a replacement. In particular, someone around here is selling a low-hours, 2001 Nissan 2- cycle long shaft 5hp, for $450. Does anyone have any experience with this motor? Is it supposed to be a good one/reliable/reasonably environmentally friendly? I don't motor a lot (just in and out of the dock), but seeing the oil slick and the smoke of my existing motor drives me nuts. I know that I should be getting a 4-stroke, but these are too expensive for what I need them to do. Thanks, Andrei.