Bad luck - that really is a bit of pain in the ar5e Phil.
It has happened before and seems to be attributed to riding for any significant length of time with the swing-arm past horizontal (the rear axle above the output shaft and front sprocket). More often than not it is due to either one, or a combination of: saggy OE Sachs shock, fitting lowering links or being heavily loaded for extended periods.
Quote:
Originally Posted by
fridolin
Hm, bad luck
 . I wonder if the plastic protection thingy there (spare part 11D-F2151-00) should protect the swingarm from such heavy damage.
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It will protect it, but only for a very short time if the chain is permenantly dragging along it. The protector is only really designed to prevent damage from chain-slap and occasional bottoming out.
Quote:
Originally Posted by
fridolin
Rtwpaul has the same damage btw.
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Yep. His was down to riding a big distance on a knackered shock whilst carrying a heavy load.
Relevant post...
http://www.xt660.com/showpost.php?p=170283&postcount=11
Whole thread...
http://www.xt660.com/showthread.php?t=18703