May not interest you but I "upgraded" to these, as the OEM bar ends I found a pain as they'd loosen too easily and were also very large.

Switching to these made the change of direction a bit quicker (or it did in my mind at least), they looked better and I guess if you're so inclined you get get coloured ones, I just got plain black.

http://www.ebay.co.uk/itm/350301926423? ... 1438.l2649

Given the enormous front-end weight with the 650 lump I didn't expect any issue reducing bar weight slightly.