Sorry to hear this (not quite as sorry as I was to hear my bike doing the same thing!)
I bought the replacement tensioner from local dealer, was charged just short of £40 and fitted it myself, there is an element of dismantling involved, draining the coolant etc
I found that I had jumped 3 or 4 teeth on the cams, didn't have time to take the head off so threw it back together and hoped!
What a result!, sounds sweeter than ever, and got a mate wanting to change his Falco for a Mille because I kept going passed him.(you know the sort - must have the fastest etc)
I recommend you try it, I will give any help that I can by way of guidance etc.
