Re: motor weights, too much?
The perfect motor for the 18 is the inline 6 Mercury 140/150 hp. (Same motor, the 140 is prop-rated, the 150 is powerhead rated.)
The Merc XS1500 150hp actually produced an amazing 215 hp at 9000 rpms, but the listed max rpm was 6000.
I ran my 1st Seafari weighing 1800 lbs with the inline-6 150 hp Merc, and top speed was 44 mph. You can still find them on Ebay, and there are several places around the country which specialize in remanufacturing the "Tower of Power"
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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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