Originally posted by afm
The latest model from Sirio, the S12TRP "Evo2" is comparable in performance to the latest Nova based engines, it has a killer top end and is very easy to tune, very stable, and withstands high temps easily. I have one, and I'm very satisfied with it. It delivers its power at a higher powerband than the nova based engines, but when properly geared and with appropiate pipe IT IS A BOMB.
The L.Collari (Innotech)company started with modified Piccos, but now they work over Rossi engines.
The M.Collari company works over Sirio engines. Check this site:
werksracing.com/query.do?manufacturer=mcollari&main=engines&displa cement=12
AFM
Are the Sirio engines Nova based then?