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Hi anyone answer this for me a new to me bike noticed a perfectly round hole on the underside of the muffler. Is this correct or should I be replacing the muffler yes it is original equipment
 

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Most all motorcycle mufflers have a "drain hole" near the lowest part of the muffler/pipes.
Some are more noticeable than others.

Probably stock and perfectly normal. Usually there are some signs of rust or carbon around it.
 

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its a drain hole for moisture when the engine is hot than cools down its ok no problem
Well actually the moisture occurs when the engine is warming up and the pipes are still cold.
The rich starting mixture releases more water vapor than normal and it condenses inside the cold pipes.
Once the engine and pipes heat up, it all goes out the exhaust.
 
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