Brad, I thought I’d chime in here. IMO, the RM-1 is a very cool kart. It is very unique and and has many innovative features – making it both cool and hard to find parts for.
However, it is uncompetitive by modern DD2 standards. So IMO, that RM-1 should be in the hands of someone who might add it to their collection to showcase it for what it is – a unique slice of Rotax history. But to simply have one as your main kart, or to try to race it competitively, its a bad choice.