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1Back to top Go down    A party inside the shaft drive on Tue Mar 13, 2018 11:56 am

StefanMajonez

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Hi!

I was riding around, minding my own business, when suddenly...





How f**ked am I and what should I be replacing? Very Happy



Last edited by StefanMajonez on Fri Mar 16, 2018 5:43 pm; edited 1 time in total


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1994 - BMW K1100LT
Dyno results 2017


Previous bike:
1989 Honda CB450S
    

2Back to top Go down    Re: A party inside the shaft drive on Tue Mar 13, 2018 12:25 pm

Point-Seven-five

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I suspect we are looking at the result of an improperly phased drive shaft.

Have you looked at the front end of the drive shaft?

At a minimum you need a swing arm and a drive shaft(possibly just the rear half).

Can you pull the shaft without removing the rear section? It would be informative to see the phasing of the u-joints.


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Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

3Back to top Go down    Re: A party inside the shaft drive on Tue Mar 13, 2018 12:50 pm

StefanMajonez

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@Point-Seven-five wrote:I suspect we are looking at the result of an improperly phased drive shaft.

Have you looked at the front end of the drive shaft?

At a minimum you need a swing arm and a drive shaft(possibly just the rear half).

Can you pull the shaft without removing the rear section? It would be informative to see the phasing of the u-joints.
There you go.



Here you have an additional photo of the swing arm itself - it looks operational to me, do you think that damage is small enough to just clean it up and use it?

The shaft is indeed a tiny bit out of phase, but would such a tiny shift cause this?

Just so everyone knows, I'm a K bike owner for a year now and this is the very first time I even pulled the rear wheel off by myself - I didn't need to do it yet. So any help or knowledge is appreciated.



Last edited by StefanMajonez on Fri Mar 16, 2018 5:43 pm; edited 1 time in total


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1994 - BMW K1100LT
Dyno results 2017


Previous bike:
1989 Honda CB450S
    

4Back to top Go down    Re: A party inside the shaft drive on Tue Mar 13, 2018 1:05 pm

Laitch

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@Point-Seven-five wrote: Can you pull the shaft without removing the rear section? It would be informative to see the phasing of the u-joints.
For an illustration of phasing, click on this link. In a two-piece driveshaft, the yokes of the joints at its ends must be oriented in the same direction. In the link, the yokes at the ends of the driveshaft are aligned vertically.


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1995 K75T 68,000 miles
    

5Back to top Go down    Re: A party inside the shaft drive on Tue Mar 13, 2018 9:41 pm

RicK G

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This will add to the link given. You said the shaft was a tiny bit out so this could explain what goes on


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"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats." from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

6Back to top Go down    Re: A party inside the shaft drive on Fri Mar 16, 2018 2:53 am

Gaz

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Can't see the original poster's photos - anyone else seeing them?


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Gaz
95 K1100LT 0232224; 90 K75 6427509; 87 R80G/S PD 6292136
    

7Back to top Go down    Re: A party inside the shaft drive on Fri Mar 16, 2018 4:50 am

92KK 84WW Olaf

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@Gaz wrote:Can't see the original poster's photos - anyone else seeing them?

Not seeing them either. They must be out of phase.


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1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 84,600 miles
1983 K100RS 0011175 Fricka 29,000 miles Damn K Pox
    

8Back to top Go down    Re: A party inside the shaft drive on Fri Mar 16, 2018 5:40 am

Matthew-Brisbane

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Same here

Must admitt that i was here to see the horror show

    

9Back to top Go down    Re: A party inside the shaft drive on Fri Mar 16, 2018 5:45 pm

StefanMajonez

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Photos are here, sorry about the confusion.


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1994 - BMW K1100LT
Dyno results 2017


Previous bike:
1989 Honda CB450S
    

10Back to top Go down    Re: A party inside the shaft drive on Fri Mar 16, 2018 5:48 pm

StefanMajonez

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@Point-Seven-five wrote:At a minimum you need a swing arm and a drive shaft(possibly just the rear half).

I'm intrigued. Every online BMW store I visited sells the shaft as a single unit, I've never seen only the rear part. Where would I find such a thing?


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1994 - BMW K1100LT
Dyno results 2017


Previous bike:
1989 Honda CB450S
    

11Back to top Go down    Re: A party inside the shaft drive on Fri Mar 16, 2018 7:40 pm

Laitch

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@StefanMajonez wrote: Every online BMW store I visited sells the shaft as a single unit, I've never seen only the rear part. Where would I find such a thing?
eBay


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1995 K75T 68,000 miles
    

12Back to top Go down    Re: A party inside the shaft drive on Fri Mar 16, 2018 10:55 pm

Inge K.

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@Laitch wrote: eBay

Usually sold as a complete unit even there.....try Bombay


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

13Back to top Go down    Re: A party inside the shaft drive on Sat Mar 17, 2018 9:10 am

StefanMajonez

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@Inge K. wrote:
@Laitch wrote: eBay

Usually sold as a complete unit even there.....try Bombay
Actually on eBay a lot of people are selling only the front part of the shaft - exactly what I don't need Very HappyAlso, shipping to Europe is costly, as most eBay sellers are in the US.

What do you mean by Bombay? My Google-fu didn't yield any results


__________________________________________________
1994 - BMW K1100LT
Dyno results 2017


Previous bike:
1989 Honda CB450S
    

14Back to top Go down    Re: A party inside the shaft drive on Sat Mar 17, 2018 10:06 pm

Inge K.

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@StefanMajonez wrote:
What do you mean by Bombay? My Google-fu didn't yield any results

Sorry......to much beer yesterday night.......to much mumbling in the bai.


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

15Back to top Go down    Re: A party inside the shaft drive on Sun Mar 18, 2018 5:34 pm

StefanMajonez

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Update: Decorations!



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1994 - BMW K1100LT
Dyno results 2017


Previous bike:
1989 Honda CB450S
    

16Back to top Go down    Re: A party inside the shaft drive on Sun Mar 25, 2018 7:16 am

StefanMajonez

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Hi!

I'm reviving this post to ask another question, before I put my bike together.

A friend of mine who is an amateur mechanic person told me that a shaft drive needs to be balanced, and I see where he's coming from - an unbalanced shaft means vibration, and potential havoc on the transmission and the shaft itself.

But he told me that I should replace my shaft with a new one ASAP because of what's on the pictures below. Is he exaggerating, or are those scuff marks enough to warrant buying a new shaft (or having this one repaired in a machine shop, if possible)?






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1994 - BMW K1100LT
Dyno results 2017


Previous bike:
1989 Honda CB450S
    

17Back to top Go down    Re: A party inside the shaft drive on Sun Mar 25, 2018 7:47 am

Dai

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You've probably lost a few grams of weight; IMHO not enough to worry about.


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'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

18Back to top Go down    Re: A party inside the shaft drive on Sun Mar 25, 2018 8:03 am

StefanMajonez

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@Dai wrote:You've probably lost a few grams of weight; IMHO not enough to worry about.

In my estimation not even that; the flash camera makes it seem rough when in fact, moving your finger across the shaft, you can maybe feel the unevenness in 2 or 3 places.

The real question is, will the shaft be all happy and dandy at 200 km/h? Very Happy


__________________________________________________
1994 - BMW K1100LT
Dyno results 2017


Previous bike:
1989 Honda CB450S
    

19Back to top Go down    Driveshaft wear marks on Sun Mar 25, 2018 7:42 pm

redrockmania

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Stefan - Looking at your 3 photographs the wear marks look somewhat superficial. If you are concerned, first discuss with a K100 expert mechanic/technician if they might cause a balance/safety issue at 200kmh. As an engineering problem it looks like an easy job to machine with a lathe the part with the wear marks until they are gone. This will address any balance problems - if indeed they exist.

    

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