Originally Posted by
Riketsu
REX is cheaper because of the lower quality of materials. From what I always understood, REX are the engines Novarossi has thrown aside because they did not like their tolerances.
It is still novarossi based, so it should run pretty reliable.
I don't think that was ever really true. The whole Nova/Rex/Top thing was really just done for marketing/distributorship reasons. The best motor I ever had was a Top R1 WSC.