Random hold on my 2005 cr85rb engine

My 2005 cr85rb has a random hole on the right side of the engine don’t know if there’s suppose to be a cover there or what but it just popped up one day the 1st picture is when I first got the bike it was normal 2nd pic is how it is I have no clue about this no mechanic touched my bike or nothing and it still starts first kick I just put a bolt in the hole it has threads
 

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