The New And Improved Unofficial R65 Forum V2

Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: Tiedie on September 30, 2025, 04:54:39 AM

Title: Extra final drive
Post by: Tiedie on September 30, 2025, 04:54:39 AM

Just purchased a extra final drive for my R65ls. It's a 32/9 like the original one. The plan is to rebuild and have just in case I need it. Found it on the bay store.

Title: Re: Extra final drive
Post by: Justin B. on October 02, 2025, 07:58:54 PM

Good luck with it.  That's about the only thing I have not attempted

Title: Re: Extra final drive
Post by: dogshome on November 03, 2025, 06:59:28 AM

How I test them on the bench:
https://youtu.be/RenY5UBd9LA (https://youtu.be/RenY5UBd9LA)

Title: Re: Extra final drive
Post by: Steve on November 06, 2025, 10:01:58 AM

I have a worn 1979 R65 final drive that needs rebuilding. Do you know anyone I can pay to do it? I have too much drive train lash.

Title: Re: Extra final drive
Post by: Tony Smith on July 05, 2026, 01:29:33 AM

Quote from: Justin B. on October 02, 2025, 07:58:54 PM

Good luck with it.  That's about the only thing I have not attempted

For what it is worth they are not difficult.

I avoided doing final drives for a long time until the R75  FD fittedto my 860 needed rehab. I was surprised at how straightforward they are.

Title: Re: Extra final drive
Post by: Tiedie on July 12, 2026, 09:44:07 AM

Quote from: Steve on November 06, 2025, 10:01:58 AM

I have a worn 1979 R65 final drive that needs rebuilding. Do you know anyone I can pay to do it? I have too much drive train lash.

Sorry for the late reply I just saw this I'm in WNC the guy I used for all my upgrades and updating is here too. DM me if your in need but as @Tony Smith said it not too difficult as a matter of fact Boxer 2 Valve has a video on how to do it. I haven't attempted it but if you have a hot air gut and patience it shouldn't be too hard. They sell a repair kit for bearings and seals and gaskets.

Title: Re: Extra final drive
Post by: dogshome on August 31, 2026, 11:05:58 AM

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.