RE: Smallest RIRE engine
CS, It is a FI, RE but don't know if they are still available. They made the Brodak motors, but I heard they won't make any more castings, so it is whatever they have left in stock. There was a pipe for it. The timing was different on the normal and the piped version. I think the Profi might be quicker though. I believe Ucktam had a pipe for the .09. There was a boat motor like that too. The Toki has no pipe and is a side exh. I don't know of any car stuff. Maybe some .12 size.