So did you Timo!
I'm rubbing one out on that.The hole is fine, doesn't hurt anything.
I don't know how you assembled your kickstarter, but that style is typically like below.
You have to deal with my mouth breathing...
https://www.youtube.com/watch?v=KFmhCuK0EPw
-BIG DAN
NBD its all inside the transmission.
That hole does go through to the transmission. So do the transmission shafts, shift shaft, and bearings. They are a shared cavity. -BIG DAN
You said cavity.
Shared Cavity! Like with your best bud and the hooker that said she likes to be double cocked.
Only gay if your nuts touch. 
.
He ain't grinning no more.
So it appears new owner (dad, my friend) let son (10 years old, never done it before) take care of mixing the premix...and either didn't put in enough 2T oil, didn't put in any, or filled from a non-premix jug, then let the kid run the bike around in first gear (didn't know how to shift), in the hot desert while he tried feverishly (and unsuccessfully) to learn how to kick-start the WR.
By the time I got there the 80 was locked up solid.
It'll be back in my shop on Monday.
I had the WR running in 3 kicks while he did one of these
.
So it appears new owner (dad, my friend) let son (10 years old, never done it before) take care of mixing the premix...and either didn't put in enough 2T oil, didn't put in any, or filled from a non-premix jug, then let the kid run the bike around in first gear (didn't know how to shift), in the hot desert while he tried feverishly (and unsuccessfully) to learn how to kick-start the WR.
By the time I got there the 80 was locked up solid.
It'll be back in my shop on Monday.
I had the WR running in 3 kicks while he did one of these
.Same thing happened to a KX250 I built for a kid. He brought it to a shop when it seized and the mechanic said it was one of 2 things, The crank was built and pressed together wrong, or he ran straight gas. Since I didn't build the crank, and purchase new, he ran straight gas. Endless to say, his dad didn't call me to complain. He knew his son Fuberdit.
You love watching me beat my head against the wall.
Just google amsoil warranty void.