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chain wearing away engine case and arm- missing a piece?

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I'm sure there is a simple answer, I'm totally new to china pit bikes and picked this is up as a project. Is there a guide or a piece missing where the left side cover is and wearing away? I'm not sure whats supposed to be in the that threaded hole (its a 110cc engine).

Also, its eating awaiting on the arm in the 2nd picture - is the solution there as simple as replacing the wornout chain guide?

pics attached

wear1.jpg

wear2.jpg

Edited by gidaeon
added pics tried to reorder

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Also found a 2nd hole next to it (bolt in it). Is a chain roller guide of some type supposed to use both holes? Both have good threads, presently. I don't want to damage further.

 

3.jpg

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