The dog bone has cracked so it needs replacing
good job you caught it in time, mine let go in spain , I was lucky I was going very slow at the time, if it had gone in the mountains it would have been a VERY STICKY ENDING
http://tuonozone.com/aprilia-tuono-1000/6111-oooopps-not-supposed-look-like.html
I just did this and used a trolley jack under the engine. No need to take anything off at all if you have nimble hands
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