I agree that until we have some real evidence, both the weight and power of the SL are in question.
Personally, I think that it will be both heavier and less powerful than Norton claim, simply because Norton’s track record in this area seems to make that inevitable.
The question is by how much, 5%... 10%... 20%...?
Scott, that list you gave is also equally suspect. As Glen posted in other threads a while back ‘creative weighing’ is endemic in the industry. Every single one of the bikes listed should have a big question mark next to it, unless independently verified.
All we can hope for is that they at least lie by a similar margin, so even though the weights given are not reliable (in absolute terms) they are at least relevant (for comparison).
And in comparing, IF the Aprilia really is ‘only’ 372lbs then there is a good chance for the SL with its full carbon bodywork, carbon wheels, lack of pillion accommodation, etc, to be close to their claim too.
We’ll just have to wait and see. The specs as currently claimed really do make it sounds like a really exciting bike. But if it’s 20% heavier and 20% less powerful than claimed, it will suddenly be quite dull.