I've not given any thought to the breather on my RGS rebuild, so when I had a look to see where it exits I found the hole on the rear face of the inner timing cover which I assume is the breather exit BUT it is plugged. Using a mirror to look in the hole all I can see is the top of a slotted screw plug. The bottom end of this engine was rebuilt by the best known engineering company on this island for BSA, so I'm assuming it was intentional. I'll ring them next Monday but has anyone in the meantime any idea what is going on here? Alan.