The 50R was the same size but did produce a higher bhp. I believe the road legal Dream50 AC15 does about 5.6 hp. It's a very high reving engine.
Yeah Mr.j, I have looked at the takegawa stuff. They do a nice 89cc kit
Both the Dream50 and 50R were built to commemorate the CR110 from the 1960's racing scene when they had 50cc racing at the Isle of Man. I've been reading up on it...that was some cool stuff back then