Originally Posted by Bulldog
Looking at a yam 130 2stroke what you lot think I spoke to outboard guy in hamble and he said with the transom being 60mm thick it would take unto 150hp ish ???.
The thickness of the transom is only part of the problem. How well is the transom bonded to the rest of the boat (most of the transom problems people post here are movement at this joint not the transom itself breaking). Of course can you control the boat at full throttle is another issue - although you can of course not use all the power, but the maximum is not just about ripping the transom off - its about flipping the boat, chine walking, etc.
Given the previous owner thought 90HP was too much, and 99% of people would be happy with a 90HP on a SR5.4, and you should need less power with a shallow V, 130HP does sound OTT to me. Even if the boat can take it - with the rougher ride you might expect then in the conditions when you might want that extra power you probably can't.