I don't think it will take long for the Bonneville to have a full water jacket. When you can control temperature you can build to tighter tolerances with higher RPMs.
I believe the America/Speedmaster may have a limited lifespan now. I don't think Triumph will make them at 1100 with a air cooled motor. 500cc is a small leap and you have the customer on a Thunderbird.
They will either be left alone or built with liquid and ABS. The general population wants ABS and they are moving to liquid cooling. I know on my bigger bike when I glance down at the thermometer in Texas heat 225 degrees vs. 180 if it was liquid is a lot of temp.
If I ever add another bike, unlikely, it will have a radiator and ABS.
I try to aggravate one person a day. Today may be your day.
