posted 03-24-2004 02:02 AM ET (US)
Dick,I, too, own a Katama. Mine has a 1982 90 Evinrude. This boat, with a 17" prop has enough oomph to get my lard-laden 205 pounds out of the water on one ski and good top end (so much that my kids request a more "reasonable" top speed).
If you are not skiing, I think a 70 would be fine. I had a 15'6 Cobia with a 75 Evinrude (you have a little less engine and a little more boat) and it moved okay to get me back if the weather turned sour. And, since you don't plan on selling it anytime soon, any loss of resale value from having a small engine (70% of max rating) would not be an issue with you. And, when gas hits $3/gallon this summer, you will be in the drivers seat...
You don't have to commit to this engine in perpetuity anyways. Buy it and try it out. If you are pleased with the performance - keep it. If not, I suspect you will be able to sell it on eBay or boattrader.com for a tidy profit.
Just my dos centavos...
Richard