It is not uncommon for the rotors to warp. To ell if the rotor is the problem you'll need to use one of 2 inspection methods. First would be removal of the rotors and mount them so they will rotate . Yo will have to have them absolutely vertically from a perfectly flat surface like a machine shop inspection table made of stone. A dial indicator will need to be set-up next to and touching the braking surface of the rotor and then rotate the rotor 360 degrees (like on the rim) checking for deflection. You will need to check both sides of each rotor. The other option is not quite a precise,but works. After you have found a flat bit of pavement or a flat garage floor, put the bike on the center stand and block under the engine so the front wheel is off the ground. Place a dial indicator to the rotor, zero it out and check for deflection on both front rotors. If they are warped, you will find it. Most likely the rotors cannot be turned down and maintain enough thickness to remain within service limits. A set from a breaker may have the same issue.
