Has anyone replaced their stock handgrips for Kuryakyn Iso Grip? The Burgman is the first bike I've owned that has had weights on the end of the handlebars and I was wondering if anyone has ditched the weights and installed Iso grips. How important are the weights...on a scooter like this, do they make that much of a difference? I'd be interested in hearing from anyone who could bring me up to speed on the subject.