Hi I am new to this forum. I have what I believe is a 1971 Rupp. If someone would be kind enough to tell me the model that would help. Also I need to know the specific engine model number. I believe it to be a HS40 but I need more specific info than just a general model #. I have to get some engine parts. This is also a replacement engine. For the life of me I cannot find any numbers on the engine. Quick history. This was a bike my son road years ago and has been in a barn for along time. I told his daughters (my granddaughters) I would get it up and going so they could ride it. Any help is much appreciated.