I've just bought a boat with a Yamaha 2 cylinder 40HP outboard Model No 6E9 Serial No: L400225 and there is also a Q on the plate. i have been led to believe that this is a 1982 model. I have tried to buy a workshop manual and my Yamaha dealer can only supply me with a manual covering all models from 1984. They say all other manuals have been discontinued.<br /><br />Does anyone know whether the 40HP changed much between 1982 and 1984, and, if so, were the differences major? i.e. Should I buy this manual?