Welcome! Need support, you got it. Or share you ideas and experiences.
While replacing floorboards in my fiberglass boat I have found the wood at the transom is very soft (i can push a screwdriver into it easily) It all seems to be intact and the back of the boat doesn't seem to flex when i move the motor. All fiberglass is in good condition. Is there anything I can do? do I need to have it replaced?
I had this problem on an old fiberglass boat with a 100hp outboard, this is what I did. I went to the salvage yard and bought a large piece of 3/16" aluminum plate. I cut this into 3 pieces. One goes on the back of the transom and covers about half of it. The other two pieces go inside the transom, one above the motor well and a larger one under it. They are drilled and bolted through with the nuts inside. These plates are rigid and spread the stress over the whole transom. This has worked for me for three years now.
Unless you want to find yourself and your friends sinking by the stern someday, you should definitely replace the transom before it fails.
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