Pull the radiator trim cover off, 4 screws, then you will see a cap just like on a car, fill to the top of the radiator and put the cap back back on. Then put the trim back on (4 screws) and you are done. There is a catch tank that the over flow goes into when the radiator heats up so don't worry about filling the radiator completely it won't be a problem.
Old Codger
