Make your own Case Saver

[Dukedesmo]

Originally Posted by utopia

I don't believe that the hammer from the broken chain is the main problem, but more that the chain can lift off the sprocket, bunch up and jam. So maybe such a scheme would be adequate.

Indeed, I believe that this is the problem. Even a thin plate will work fine as all it needs to do is keep the chain on the sprocket for a maximum of 100 links or so, after that it's job is done.

The damage comes from the buildup of chain that can't escape and gets rammed into the soft crankcase at huge force/speed.