Has anyone had to replace the six cush rubbers in the rear wheel on their GT1000? I am at about 10,000 miles and the bike has started to run "snatchy" unless I am accelerating or really keeping the revs up. The chain and sprockets are fine. If I put the bike up on a stand, hold the rear sprocket and rock the wheel back and forth there is about 1/32nd play between the sprocket carrier and the wheel. Is this within normal limits or are the cush rubbers/bushes shot? Any opinions? How straight forward is replacement? Thanks for your input.