WTF??? hole on bottom on engine

[mbmO8]

I was just looking at my Engine as I have a coolent problem when I found this hole on the bottom of the engine but it looks to uniform to be damage but still looks wrong

There’s a picture of it, it is directly under the top end

[Calum]

The hole is normal.

[HOTSHOT III]

@mbmO8 All DTRs have this, can't remember the reason for it offhand but it's nothing to worry about.

[Calum]

@HOTSHOT-III Wasn't it just a crankcase breather from air pressure build up

[HOTSHOT III]

@Calum I think it's something like that yes, that part of the crankcase is just an empty space.

[SpookDog]

Yeah, a closed void would be subject to repeated heating and cooling stress. It’s also really handy for helping get the cases split
I remember that I crapped myself when I first found it. I covered it with sealant