Very brave tearing down the inside on something as big as that.
Looks like it`s fairly under sprung on the rear?
I am used to lane splitting through all of Central Asia and Russia etc. that chap decided to use the gap I was aiming for
The spring may be a bit worn, but i am not sure about that as it was designed for 400kg so I am thinking the shock may need regassing because it does settle a lot more than it used to