I'm on my second 900 and have always revved the nuts off 'em when necessary
I spoke to Neil at Sigma about this t'other day, as he does flywheel lightening. When combined with lighter pistons/rods, this means a drastic loss in moving mass, making it much safer to rev higher.
Unfortunately it also means the loss of the deep duke throb that's all the character in a 2v, so I'm not too sure about getting it done. Probably easier to buy a weekend rice rocket...
Cheers,
Ali