Update
Finally got some time to mess w/ the Sutphen. My father found out that the motor is actually an 1981 90hp.
w/ the 1979 100 cowling.
As it turns out, the motor was only running on one cylinder :yikes:
I didnt even know that was possible! lol
Anyways, we narrowed the issue down to 3 bad coils, Swapped them from another junker motor, Butt-spliced some old deteriorating wires and it's as good as new.
We took it out in the ocean for a quick test run and boy is this a fun boat. It shoots out of the water faster than a jetski and handels real nice too. I am amazed at how fast it is out of the hole.
The speedo was reading 35mph, but we all know how accurate those are. It cruises very nicely and planes out just over harbor speed, with the engine sounding like its ideling. Very efficiant cruising boat, and Its so low to the water, I almost forgot what that was like. Im very pleased with it so far. Ill shoot some pics next time.