Originally Posted by Dirk Diggler
You can't fit a Bravo Drive to a Yamaha Transom. I suspect the suggestion was to replace your current drive and transom with a Merc one, using the Yamaha inner transom plate to hook it all up.
You'd also need a Merc raw water pump and a shift bracket to make it all work.
What I mean to say is that in the US most people say the hole isn't the same and the inner transom won't work. I'm wondering if anyone has done a writeup on this. I have heard enough people say it will work that I am seriously considering buying a bravo (and transom assembly) but it would be nice to have some confirmation from someone who has done this. I have suspected that much of the advice I've seen posted in the US forums is from mechanics who really just want you to repower. They also say parts are not available and I have had no trouble finding parts.
I have a couple of more questions.
1: Doesn't the mercruiser have a raw water pump in the lower drive? Do I just remove the impeller and run an external raw water pump?
2: How do I know what gear ratio to purchase? I do not know the current ratio or how to find it but I know mine is a 300hp 7.4 and was turning a 16x16.