Erick,
Congrats on purchasing and refurbing your S2 27. Most of us here agree that our S2 27s are somewhat underpowered by the 1GM10. Having said that, these engines seem to be incredibly reliable with proper maintenance...they are thumpers, to be sure, and with a bit of shake. Max rpm is about 3600, and they seem to run most efficiently at about 3000 rpm, where you'll get the best torque and fuel economy. In calm conditions, it will push my boat to about 5.6 kts with my two bladed prop at 3200 rpm.
Sticking a heavy 4-cycle outboard on the stern may well throw off the fore & aft trim. You will need an extra long-shaft outboard, and a substantial mount with a LONG adjustable throw (maybe a Garelick, ). The transom height (and freeboard) on the 27 is pretty significant. Electric start would be a must, I'd think, due to the height of the transom.
Personally, I'd try to get the Yanmar up and running again...One guy's opinion.
Dave S.
s/v Clio
1987 S2 27, hull #80
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--- In s227classassociation@..., Bob Taylor <woodwork@...> wrote:
Hi Erick,
Welcome to the group. The first S2 27 I ever saw was in New Hampshire.
It was being rebuilt near Newmarket about 4 years ago. I couldn't make a
deal with that owner and started looking around closer to home.
The Yanmar 1GM10 can push my boat at about 5 knots. If that's enough for
your river currents it has to be cheaper to replace the starter &
alternator than buy a new, more powerful outboard and the mounting
brackets, plus installation that you'll need.
In my humble opinion,
Bob
