I just got a Baja Designs light kit for my YZ426 and it weighs the flywheel 11oz. already. So I have a Terrycable 12oz. flywheel weight for sale. The package has been opened but never installed. The dealer wouldn't let me return it because it had been opened(Wilson's Yamaha, Fresno) do not buy from there. Anyway I paid 160.00 for it, I'll take 100obo. So if your close to the Fresno, Ca area and would like it, e-mail me(RiverparkDude@aol.com). This is the bolt on model.