.could any bold tell me what the big nut does that is behind the frame where the swinging arm bolt goes through,and do worn sprocket carrier rubbers cause vibration,thanks

Look at the images here..you'll see the point of the big nut..a good idea IMO.

http://www.xt660.com/showthread.php?t=20738






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thanks for that mate

Big nut = good nut.

You can always tighten it from the outside with a 15mm hex key.

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Bike: 2013 XT660Z, TKC70 tyres

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