Hi Joe Seem to think there was a little rubber sponge thing under that lid with the hole . I will sort an old engine out, (that's the only sort I have now) and pull apart just to refresh the brainbox.
As you say those engines are really old hat but were good engines if you looked after them.
My current use mower, used every week is a Rover with a Briggs and is now close to 40 yrs old. I traded it before I went on the farm; 25 yrs there and now 10 yrs back in Sale and still going really well.
Was used in Sale for at least a couple of years before going to the farm and would have been a couple of years old when I traded it.... Cheers Joe
