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Author Topic: Extra final drive  (Read 5930 times)

Offline Tiedie

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Extra final drive
« 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.

Offline Justin B.

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Re: Extra final drive
« Reply #1 on: October 02, 2025, 07:58:54 PM »
Good luck with it.  That's about the only thing I have not attempted
Justin B.

2004 BMW R1150RT
1981 R100RT - Summer bike, NEKKID!!!

Offline dogshome

  • Lives in Foothills of Mt. Olympus
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Re: Extra final drive
« Reply #2 on: November 03, 2025, 06:59:28 AM »
How I test them on the bench:
https://youtu.be/RenY5UBd9LA
肉(r?u)包(bāo)子(zi)打(dǎ)狗(gǒu) (meat+bun(2nd and 3rd)+hit+dog)
* Literally: To hit a dog with a meat-bun.:-O

Offline Steve

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  • 1979 R65 with 175k miles
Re: Extra final drive
« Reply #3 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.


Offline Tony Smith

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Re: Extra final drive
« Reply #4 on: July 05, 2026, 01:29:33 AM »
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.
1978 R100RS| 1981 R100RS (JPS) | 1984 R65/860 | 1992 KLE500 | 2002 R1150GSA | 2021 BRAAAP St250| 2025 Himalayan 450 |

Offline Tiedie

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Re: Extra final drive
« Reply #5 on: July 12, 2026, 09:44:07 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.

Offline dogshome

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Re: Extra final drive
« Reply #6 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.
肉(r?u)包(bāo)子(zi)打(dǎ)狗(gǒu) (meat+bun(2nd and 3rd)+hit+dog)
* Literally: To hit a dog with a meat-bun.:-O