I just bought an old Tri-Hull boat with what is supposed to be a 73 Johnson Stinger 2 65 HP outboard. The model and serial are 75ESLR75B, J4302817. What I find on the net is that this is a 75 HP. Can anyone help, I need to buy a impeller for it and service manual and want to get the right stuff. Also, does anyone out there know what the fuel/oil mixture is for this motor? Thanks!