A few more notes.. the 4/5/6 tohatsu/merc/nissan 4 stroke
are all the same with just a 6hp carb required to upgrade the 4 to the 6, for example. They weigh 57-60lbs. Tohatsu makes a "high thrust"/larger prop which will make all the difference on this motor
, and is worth the $60-80. This is the prop that comes stock on the "sailpro" versions of the motor
As boatguy mentions the newest yanmar
9.9 is based on their 8hp and somewhat lighter than earlier generations, not sure about the gearing on it however, the important thing about yanmar
9.9 is to get the high thrust version with the lower gearing along with larger prop. 4500rpm with a larger prop vs 5500 to 6500rpm with a smaller prop. This pushes larger boats much more efficiently than most other small outboards that were designed with small boats in mind.
The tohatsu/nissan 9.8 two stroke is also very light for it's power (60-65lbs longshaft/ultra longshaft), if you can track one down (rare and of course no new 2 strokes in the us)
Finally the old (2002 and earlier) 3.5 tohatsu/nissan/mercury3.3/johnson3.3 is actually not a bad choice where weight is critical (27-30lbs longshaft) and you just need a motor to get in and out of the harbor, or to be race legal