Picked this up yesterday, original ruppster, i was told 1971. It has the original Rockwell JLO 230 with electric start! Spent a day and a half working on it and already got the engine to run on a shot of gas. Looking to install the gas tank soon. The gas tank looks almost NOS. I also have all the other parts for it in a box, steering wheel, pedels, ect... Does anyone know how many years these were made? And how to differentiate between the years? Also i know the original engines get hot and overheat, and the engine fan sucks up dust. So what can be done to resolve these issues? Also any other info would be great!