Have you had your primary off lately?
I believe the best and only way to seal the primary is to verify that the surfaces (inner and outer) match up proper. Behind the inner at the mounting stud in the center is were shims go to bring it all home (square). " 060399 3/8" Washer Shim, .027" Thick" Otherwise, when securing the outer at the center bolt you will flex at the point were the inner mounts to the crankcase causing warpage at the mating surfaces and therefore areas that will not seal even with a new o-ring . This needs to be done, of course, before final assembly. There will alway be an issue unless done right. I hope this is not too bad news.
Last edited by pete.v
on Thu Mar 25, 2010 3:34 pm, edited 3 times in total.
1972 Norton 750 Commando Roadster