Question on A7 cases..

[JoelCardoso]

Hi..
Can somebody tell me why is this hole in the case off the BSA A7..
Congrats
Joel Cardoso

[DAVE BRADY]

Hi Joel,

This is the outlet for the timed breather.  If look on the other side there is a part that looks like a top hat that fit on a peg on the cam pinion.  As this turns it lines up a passage way that allows the pressure in the crank cases to be eased as the pitsons come down the bore.  If you blow through it you will see how it all lines up.
Do you have a workshop manual?

Dave.

[JoelCardoso]

In my BSA some genius was blocked this hole...
I already buy the Haines manual but i'm waiting to receive it.
Joel.

[DAVE BRADY]

Hi Joel,

The breather passes through the crank case to the other side.  The holes are marked with an arrow.

Dave.

[JoelCardoso]

Thanks for the explication..
Joel