YG-one

Hello I picked up what i believe to be a 1964 Yamaha YG-1 on the weekend. I called Yamaha with the serial numbers (Y20864465) and they agreed on the date/model but with some uncertainty. I would like to make a restoration project out of it, but im not sure where to find information. Ive searched around and have not seen anything that looks like an official service manual, and to my surprise have not found any dedicated forums or websites for the bike. Has anyone been through this? owned or restored one? Any help is much appreciated. Thanks, Jake