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               Originally Posted by 
              Petenz  
              35 odd years rideing and 34 bikes... never had a chain come off...
              Have broken 2... IT465 & 1100 Katana at a drag meet..
 Sorry... more of a owner issue than a bike issue...
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         Sorry, but it is more an issue of having a chain guard or not, so it's a bike issue.
        
 I hadn't a derailed chain on my bike too. But every bike I owned had a chain guard. So rethink if any of your bikes had no chain guard. Your IT465 had one for example. A Katana 1100 doesn't need one. It's a road bike. IMHO a chain guard is compulsory for a trail bike. That's why most of them have one.