Re: 90 or 115 ETEC for 18SF?
The 115 Etec is 390 lbs, just 15 lbs more than the 75-90-115 Optimax. (a bit less than the old 20" V6 Mercury's at 396 lbs.)
In contrast, the 90 hp Etec is just 335 lbs. If you've got a reliable Tohatsu/Nissan dealer nearby, the commercial HPDI 90 hp Tohatsu is only 315 lbs, the 115 is 390 lbs, same as the Etec.
Yamaha no longer sells 2 stroke HPDI midrange motors in the USA. (Still available in Canada, Mexico, and the Bahamas, though) The F90 is 369 lbs, the F115 is 414 lbs.
The Yamaha HPDI 90 (as sold in the Bahamas) is listed as 317 lbs, the HPDI V4 115 at 367 lbs.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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