chain hitting side of crankcase

i have a yz85 and my chain is eating grooves inside of my crankcase what is the guard called to keep the chain from doing that

Case saver.

 

You might have put to wide of a chain on, some O-ring chains are not compatible. Or, the sprocket has a lip and is on backwards.

 

You will find it most likely in the case section, but on that bike it is probably part of the flywheel cover. 

Chain slider? Long black plastic piece?

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