Compared with the production version, there were plenty of subtle differences. I mostly restored this R1 about fifteen (>15) years ago, but have recently taken a new interest in it (in other words, I have more time on my hands).
For my next project, I want to build a second frame (I already have nearly all the parts to complete it, except an actual chassis) so I can run both a single engine and dual engine classes at my next VKA** event.
**Vintage Karting Association vkaracing.com