Where ca I get th RB Concepts engine specs. They are not stated @ RB Concepts web site. NovaRosi gives all the speca i.e. 2.75hp @ 30,000 rpm. I would like to know the specs on thw wsll7 engine etc. any advice?

You wont find them anywhere. Novarossi does give specs, but JP racing does not as well as all the other higher end engines.

Rody Roem keeps those a secret - says that you can skew the numbers anyway you want, and he doesn't want his compared to false numbers of others. It's also a trade secret thing. I assure you though, that all my RB engines are extreme powerhouses.