Hole in engine head?

Is this hole supposed to be in the engine head? 196cc clone engine. Behind the spark plug. I attached 3 pics. It runs good, just recently noticed it there.

If its leaking i dont think so…

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Nothing to worry about. Just some thin casting flash that hasn’t been removed. Chip it back with a screwdriver etc.or clear it with a Dremel if it bothers you.
Edit. Had a look at a clone engine here. The ‘hole’ is one end of a cast in passage through the cylinder head under the rocker box. Its purpose is presumably to flow some cooling air from the fan. So no problem . It’s meant to be there. Clean up the rough edges if you choose.

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Okay good to know. Thank you for the reply!

Thanks for the info!