These are scans of original (and rare) brochures and leaflets, they are full of useful information. To keep the loading time to a minimum, I have reproduced them below in a small format. Where text needs to be readable, just click where instructed and you will get a large (readable) version of this area -this will take some time to open.
Click the pic for a larger version.
The page above shows both the model 45, on the right, and the 55 on the left. These are the models as of about mid 1980's. Note the pics on the page show the steel fuel tanks, where as the lower diagrams depict the correct plastic tank of the later gulls. Pic courtesy of Greg Taylor of Queensland.