Correct me if I'm wrong but you've fitted a 1000 rear caliper to an FZS using the 600 hanger did you modify the hanger to accept the caliper?
The other likely culprit is not undoing the torque arm bolts when adjusting the chain, over time not undoing them twists the mounting and eventually they shear off, just like yours has! Seen it quite a few times over the years on all types of bikes.
The other likely culprit is not undoing the torque arm bolts when adjusting the chain, over time not undoing them twists the mounting and eventually they shear off, just like yours has! Seen it quite a few times over the years on all types of bikes.
Later