Check the mounting area
Bill,I have owned two 25 O'Day cb's and on both of them the plywood core in the transom was compromised. My first boat ( a "78")was not that bad.My "79" the plywood core was dust. I ended up cutting out the whole section from the inside and installing fiberglass roving in it's place. Ugly job in the "79". The "79" with the gas tank and ice box built into the cockpit. Know that I go about 230 pounds. It was tight. The "78" does not have the ice box and gas tank in the cockpit. It had plenty of room in the bilge to work. To insure strength, I laminated the stern with two 1/4" aluminum plates about 12"x20" bolted in the corners with 1/4" bolts ( all set in 3M 4000) then installed the angled block and motor mount.good luck,r.w.landau