Thanks EB. I noted the bolt hole orientation. I believe that was used for the P11 and G15CSR. But the shape of the boss is not circular as it is on my CSR cover. The part # for the P11 and CSR covers is the same.There's a blue P11 in the: 'P11 Daily Rider' thread that looks as if it has the tacho bolt holes in a similar orientation, though how it's machined beneath who knows?
Plus, angles and perspective can be deceiving :-(
Thank you Dave. The first photo shows a cover without a tach drive hole. The second photo shows a circular tach drive boss. My question relates to the ovoid boss with angled bolt holes.http://atlanticgreen.com/NHTtimcvr.htm
Look at T2004 and 25186WM which are only casting # not part #
That's it!! Thanks Slick. And a very pretty Atlas!My 1962 build Atlas has a tach drive boss that looks like that. Same orientation to the bolt holes, but I do not remember how the machined inside surface looked.
Slick
EDIT:
This is a pic of a spare tach gearbox for my Atlas. The drive end appears to be a match for the machining in the timing cover above.
View attachment 78905
and on the bike ....
View attachment 78909