BMW k100rs final drive help

Post your K Series technical queries here

Moderator: Moderators

Forum User
Posts: 1
Joined: Tue Jan 16, 2018 9:25 pm
Country of Residence: United kingdom

BMW k100rs final drive help

Postby Milan » Tue Jan 16, 2018 9:47 pm

Hi all, hope you all had a good new year:) I am in the process of building a cafe race out of a BMW k100rs 84 and I've just ran into a hurdle. I want to get the engine and swing arm powder coated which requires all Bearings and seals to be removed. My problem is how do I remove the rear drive pinion assembly? My Haynes manual says to 'not disturb' it but Is there any way around this? Will BMW be able to remove it for me? Just seeing if anyone has had any experience in this department and could advise:) Many thanks in advance!

Sent from my iPhone using Tapatalk
You do not have the required permissions to view the files attached to this post.

User avatar
george baker
Moderator/Club Member
Posts: 6530
Joined: Mon Aug 01, 2005 10:51 am
Country of Residence: uk
Location: Manchester,UK

Re: BMW k100rs final drive help

Postby george baker » Wed Jan 17, 2018 2:39 pm

welcome, where are you based?

Have you tried realoem for a look at the component parts?

IIRC haynes says not to disturb cos of the difficulty setting it up again. Have you searched the site? I seem to remember seeing a thread about setting it up after reassembly

Member 21, R100R, K75 and a Hyosung 250 FOR SALE

Bill Smithson
Forum User
Posts: 827
Joined: Wed May 24, 2006 11:20 pm
Country of Residence: England
Location: Kendal

Re: BMW k100rs final drive help

Postby Bill Smithson » Wed Jan 17, 2018 5:21 pm

It might be worth making a cover plate to fit over the end of the drive and bolt it on. Powder coating is not hot enough to cause any problems and it would avoid a lot of of potential problems with dismantling and reassembly.

Mike D
Forum User
Posts: 1494
Joined: Thu Oct 18, 2007 3:12 pm
Country of Residence: UK
Location: Near Daventry, UK

Re: BMW k100rs final drive help

Postby Mike D » Wed Jan 17, 2018 9:33 pm

If you do plan to remove the pinion, then the whole drive needs to be secured so that it can be locked. The big nut you can see needs a 36mm deep walled socket and will (should) be very tight at 180 - 220 Nm so requires heating before you start. The castellated ring (which houses an oil seal) can the be removed. There is a special BMW tool (33-1-700) for the threaded ring.

I would go with Bill suggestion to save on fully stripping the rear drive.


User avatar
Forum User
Posts: 2883
Joined: Sat Nov 12, 2005 1:00 am
Country of Residence: Norn Iron
Location: Islandmagee, County Antrim, North East Ireland

Re: BMW k100rs final drive help

Postby Jaythro » Thu Jan 18, 2018 1:00 am

Okay Let me make this simple !!!

Cut a plywood cover and seal the area with Silcone that will peel out!

Do not strip that down They will make a bollix of it!

Sometimes working around is way better than toeing the line exactly [-X
"Put your Ass on a motorcycle and ride with an attitude and the "Grim Reaper" will ride in your shadow!"

Islandmagee in case you're interested?

Return to “K Series Q&A's”

Who is online

Users browsing this forum: No registered users and 4 guests