just finished taking off alloy can to replace with lurvely shiny new titanium.... looked down exhaust and saw this!!!!
anyone got any bright ideas?

bike is bandit 12, R reg, 12,000 miles (10,500 last year, garaged previously). When lifting the zorst up and looking down (as best i could as it is S shaped) appears that this inner tube is broken in two places, half way down, just downstream of some holes / perforations similar to inside of can, and at this end visible. Not sure which happened first... i.e. welds visible went and then broke at holes halfway down or other way round. I would be inclined to think that it was halfway down first (as closer to engine and unburnt fuel?) and then vibration caused fatigue and failure of welds visible.
i would like to know what might have caused the welds to crack and the inner tube to come away? note that my current can (ART race) replaced the stock one and does have a tendancy to pop and fart on the over-run... might this be causing unburnt fuel to combust in the zorst and hence overpressure the welds? If I can find the root cause i could hopefully prevent it from happening to the next one!
comments / advice welcome... off to ebay for a search and call breaking point in the morn!!!
boo hoo :cry