Join Date: Sep 2001
Location: Aurora, CO USA 80013
The Ducati's lost their advantage in 2003 when the AMA upped the displacement limit of 4 cylinder bikes from 750cc to 1000cc. The old rules allowed 1000cc twin cylinder bikes to compete with 750cc fours. The AMA never upped the displacement limit for the twins, which remains at 1000cc. I beleive that the rules still allow for a slight weight advantage for the twins, but the fact is, the 1000cc twins simply cannot compete against a 1000cc inline 4 as the AMA rules are currently written. I suspect that in World Superbike, they not only give a weight advantage to the twins, but also allow more engine mods vs the 4-cylinder bikes.
Ducati is lobbying the AMA for a displacement limit increase to 1200cc. As you mentioned, speculation is that Ducati will leave AMA racing if they don't get it.