Triumph wouldn't even have to do a new engine to make the Americas and Speedys (Speedies?) seriously bigger.
We know that the current design can be made to go over 1100 cc's with a little crankcase mod, so it shouldn't be too difficult for Hinckley to take it out to around 990 or so. This should be a reasonable size for maintaining reliability and keeping costs within reason.
It would also be a competitive bike with all the Vee 900-1100 crusier bikes out there, as the BA/Speedmaster's total weight is lower.
