Cylinder Head rear cover help please!

[Rob Irwin]

Hi All (you legends),

It's been a few months off the road but I've finally got all the parts to replace a blown head on my YD25 powered D-40.

I have a question in regards to the rear head cover plate. Underneath the cover there is a ball (probably as a valve) on the right hand side looking at the rear of the head. Pic attached and marked in red. The blue arrow denotes a channel that leads to that ball. The new head has a grub in place of the ball (not sure if it is under the grub).

The grub looks as though it has thread sealer in there so I'm not sure that I should remove this.

Any ideas?

Thanks heaps,
Ron

 

[Rob Irwin]

I managed to resolve. For anyone who wants to know. The grub stays!

 

[Colonel]

I managed to resolve. For anyone who wants to know. The grub stays!

Thanks. I'm picking up a new head today, so in need of any useful info before I begin to install it.