I thought I'd share something I did to reinforce the transom on my H22. Last month I installed a new Garelick auxiliary outboard bracket & a new Nissan 9.8 4 stroke. While drilling new holes for the bracket through the transom I noticed that there's a hollow cavity between the exterior & interior of the transom. Neither seems adequate for my motor which weighs appox. 90#, however, I installed the bracket & motor. As soon as I did this I could see the exterior of the transom flex when I swung the motor bracket up and down to see how it worked. Placing wood on the inside would help but it would do nothing for the exterior. What I did was drilled (4) 1/4" holes on the interior and injected the cavity with a minimal expanding foam. When I bolted the bracket, it no longer compressed like it did without the foam. and the flex in the transom is gone too. I also used a couple 1x4's on the inside. I don't know what others here have done but I know that the extra weight of a 4 stroke seems a bit much for the original H22 transom.