I have a 1989 yamaha 40 hp and I was thinking about putting bigger carbs on it. I was wondering if any of y'all could point me in the right direction on going about this. I'm some what new to this but I do have a little knowledge about outboards. I know I will need to redo the exhaust to make it run right but what else is there to it? And what year model carbs will bolt up to my motor? I was talking to a guy the other day and he said something about putting 70 hp carbs on it, can this be done or will it need a new head and everything for it to run right?

Thanks!