Acorn,
We owned a 1980 25+ for 5 years before upgrading to our current 35-3. We LOVED the boat. It was the perfect starter boat for our family and I'd still be sailing it today if it wasn't for our kids growing up and needing a little more space. We sold it 6 years ago. Here's the posting I put up here with all the things we worked on during our ownership:
We’re a few days away from closing on the 35, so it’s time to sell our 1980 25+. I’m finishing up the core repair on the port side of the cabin top, but I thought I would put it up here before I’m finished and post it for the rest of the world. We’ve owned Luffalee for 5 years and have put a...
ericsonyachts.org
The two main issues that were specific to the 25+ were the compression post base Scott mentioned above and the cabin top leaks that rotted the balsa core. Hopefully your boat had some careful ownership and the cabin top core issues was avoided. The compression post base is more of a design flaw and almost impossible to avoid. If it hasn't already rotted out, it will eventually and will need to be addressed. Ericson quickly addressed this flaw by adding a fiberglass grid to the successor, the 26, somewhere around '84
For rigging, we found the easiest change that provided the most immediate impact was right sizing the running rigging. our main sheet, traveler, and vang were all way oversized for the sheeves. Changing over to 5/16 line made a huge difference.
We also changed out the traveler, added self tailing winches, installed a tiller pilot, and rebuilt the back stay. Each one made a significant difference, but those are all somewhat expensive. The self tailing winches were by far the best upgrade.
We found a 110 was just about perfect for coastal cursing. It was easy to handle and didn't provide that much difference in power compared to the larger 120-130. Downwind, the asymmetrical was a lot of fun and saved us form motoring on many trips.
Adding creature comforts like shore power, a bulkhead heater, and a working stove (the Kenyon pressure alcohol leaked and I couldn't find parts) made a significant difference for the rest of the family and weren't that difficult.