Have you checked for a flat spot in the tire or a tread separation? Also, have any weights been flung off?. I'd suggest getting the wheel off the ground and check to see if you can visually see any run-out or wobble in the rim. If so, you need to have the rim trued (spokes tightened and/or loosened). If thats not the problem, you may a bad balance job, bent rim, or a bad tire. More than likely it's not the forks. If it happened all of a sudden, you probably flung off some weights.
I'd suggest have the Suzuki dealer check it out to be sure.
Good luck.
