drive shaft destroy k100rs 1991

[Kevinb]

Hello everyone,


I'm in Montreal, Canada, I have a K100rs 1991 that as being started cafe by the previous owner.


I made the mistake to belive him when he told me the spline has been maintenance not long ago, the bike was in descent shape, so I had no reason to not belive him. Big mistake, what would have been a 1h job last week became a nightmare!


So I'm seeking advice, first I toke pretty much everthing appart, the final drive as no damage (tx motorcycle god), the U-joint is completly destroy and the shaft itself as the surrounding rubber partialy damage (but maybe by time), see picture


so :


1-should I replace the shaft as well, or it fine like that?
2-can other part as being damage by that destruction?
3-is there other model that are compatible, just u-joint or shaft
4-any idea where to find those part in Canada?
5-I eard about a specific grease for that, what the name and where can i find it?
6-anything esle here I should considere?


Thank you in advance


Kevin

[Blue]

Am I the only one who can not see the photos of this completely destroy u-joint and nightmare drive shaft?

[Kevinb]

Sorry

[Laitch]

Photos need to be directly in front of the shaft and clearly focused, Kevin.

[Kevinb]

the teeth are fine, it's the rubber that worries me, that why the angle, and the focus got lost in the downgrade quality to be able to post it  :(.


Tx

[Blue]

The U-joint is not completly destroy?

[Motorhobo]

How come I have three K75 driveshafts lying around and none of them have any visible rubber? Is that a K100 thing?

[Kevinb]

No, it's tottaly fuck

[Blue]

When my u-joint looked suspect, I got an OEM match from Rock Auto.  I do not have that K100 any longer or I would look up the nomenclature for you.

I think there may be cheap u-joints from China that may fit.  I think there are a few members here that go for cheap alternatives from China.

[barrydm]

I just did the same job on my 1990 K100rs. My u-joint was blown apart just like yours. I ended up getting a used drive shaft ass'bly from a wrecker in the UK for a not unreasonable amount of money; plugged it in and away I went. Pretty straight-forward job and not a lot of money

[The Mighty Gryphon]

Is this what happens when the u-joints aren't phased properly, or is it caused by something else?

[Kevinb]

Hi,
I don't know if it was phasing, I just got the bike and it was completely destroyed when I opened the casing, that would be pretty dum doh, it's very simple too phase.
Since I didn't get any advice I went with what I thought, I keep the drive shaft, just got a use U-Joint from a UK shop name Motorworks, great service, the part was A1.
And because I'm doing all my mechanic in the streets, I will bring the bike to BMW, so they can check for further damage and lube the spine at the same time.
And funny, I can't find any of the BMW recommended grease in Canada, so, just for the transport purpose,I put red n tacky, I'm sure it's shit, but that will make it for the transport.So basically, I still have all the same interrogation, but winter is coming, no time to wait, so I will pay for the answers.
thank you

[John Lang]

Honda M-77 'assembly paste' is available in Canada -- see nearest Honda dealer. Make sure the contents of the tube have not separated into a gray liquid and a hard black lump before squeezing the tube and losing the liquid. If separation has occurred, cut open the tube and re-mix the solid and the liquid with a spoon before applying.


Laitch suggested Loctite LB 8012 Moly Paste. This should be available in Canada.


Bon chance.

[Kevinb]

Thanks mate,


she's going to BMW today, so I guess they will put the NBU30


But I will look into it for the futur


Thank you

[Kevinb]

Sorry

So to respond at that question, yes, that drive shaft is done, that rubber is like the anti-shock system of the drive shaft, so back to ordering parts online!