Join Date: Aug 2007
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If you will be using the boat in relatively open water, fighting chop, wind and current on a worst-case basis, I suggest 5-6 HP.
If you are on protected inland water, no current and modest chop, I'd say 3.5 HP will do it.
If your runs under power are less than a 3 or 4 miles and you are daysailing, you may prefer an integral built-in tank... no auxiliary tanks or hoses to clotter the cockpit... fill it at launch and you're good for the day. My 3.3 HP 2-stroke runs full throttle for about 50 minutes on one tank (just over a quart of fuel mix)... plenty for my lake sailing.
2-strokes (no longer sold new but used are listed everywhere) are simpler and lighter, but noisier, smokier and less fuel efficient than 4-strokes.