This topic has been moved to BMW Technical Q&A, Primarily R65.

https://bmwr65.org/smf/index.php?topic=10951.0

New seals straightforward. Seals and bearings also, but check backlash before and after. You may have started with a quiet fd, with more backlash than specified. Which is fine.

You do need a couple of special tools. You can make the support plate with the hole in it.

Shims and belville washers can be bought, but if the backlash you have with the original shims is as per old one, or closer to spec, don't mess.

I couldn't stand it any more!!! The two into two unequal length slash pipes were still a wall of sound over 60MPH. Good fun in town and pottering on B roads, but spend more than 20 minutes on the A1 (at motorway speeds) and it was driving me mad. To rectify this, I've fitted a two into one with a large (allbeit straight through) muffler. Cobra's tag line is "Ride Loud!" 

It is massively quieter and because the 2->1 does not step down at odd lengths like the muffler inserts, performance is much better. Smoother and using noticeably less throttle at speed. I really have to keep any eye on the speedo now.
 

So my speedo is ticking miles as if they were tenths so adding up fast. Anyone have any recommendations to repair or refurbush.
While im at it I'll send in my tach to get done at the same tims it bounces and has that famous glass fog in cooler weather.
Thanks in advance for any help making a decision where to send.

I would try to rethread them with 1 of the xhaust thread cutting tool https://www.euromotoelectrics.com/product-p/exnuttool595.htm I would think it would clean it up and as said before new nuts and lots of anti seize  lucricant.