Originally posted by jag
The RB is based on the Novarossi but the Collari is based on the Sirio I believe.
The Sirio, Mega, Picco all seem to have very similar crankcase? It has to do with the engine monoblock for the 710 ... there are 2 different blocks depending on Picco/Mega based engines and the other is for Novarossi based motors ... I have the Mega/Picco one so need to get a motor that will fit :-(