First off I wish to say hi all and that this is a great place for info .I recently purchased a 2003 Islandia with the merc 250 opti.I have been looking all over for info and keep coming up with dead ends. So I’d like to ask the experts (owners).#1 What plugs should be in this thing and with what gap? Have had several different answers. #2 Wear ring gap spec.#3 Where can I find impellers and wearrings?#4 why is so difficult to find support for the 250 optimax?or anyone know where to get good info?#5 On glass @5500 rpm what top speed ? I am getting about 40 with 2 persons(350lbs) on board . I’m sure ill have more questions but ill start with this .Thank you all in advance .