The Clymer Mercury Outboard Shop Manual 45-255 HP 1972-1989 is written specifically for the do-it-yourselfer with first steps that involve a complete disassemble of the machine. It then provides step-by-step instructions that allow you to safely and efficiently service and repair your machine in a real setting, without the need for a professional workshop. It's this that sets Clymer repair manuals apart from its factory counterparts.