BMW K bikes (Bricks)


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1Back to top Go down    Mirror Vibration on Sun Aug 09, 2015 8:44 pm

Tfreeze

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Hello All,

I have been putting some miles on my 1991 K100RS since working out a lot of the bugs. What I have noticed is that my right mirror begins to vibrate to the point of uselessness when the engine revs above 3000rpm. Below 3000rpm= same as left. 

The left mirror is always fine.

Is this normal/ curable?

Seems odd that only the right mirror does this. My current theory (plucking at straws here) is that the right side is where the crank shaft is. 

I read before buying the K100 that they can vibrate bad. This bike does vibrate, but not as bad as a Honda VFR I had.

    

2Back to top Go down    Re: Mirror Vibration on Sun Aug 09, 2015 9:01 pm

indian036

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How are the fairing mounts?  Mine were broken away from the fairing shell, though not very obvious until the fairing was removed. Also, how solid is the mirror mount to the fairing? Mine had the rubber insulators missing when I bought it. 

Bill



Last edited by indian036 on Mon Aug 10, 2015 12:25 am; edited 1 time in total


__________________________________________________
1985 K100RT  VIN 0028991  My original Very Happy   (Historic rego)
1985 K100RT  VIN 0029036  BOB the Blue Old Bike  (Historic rego)
1990 K100LT  VIN 0190452  Work in progress
1984 K100RT  VIN 0023022  Work needing lots of progress

1986 K100RT  VIN 0090542  Work needing lots and lots of progress
1993 K1100LT  VIN 0183046  Work in progress
1993 K75S  VIN 0213045  Newest toy, slightly non-original
    

3Back to top Go down    Re: Mirror Vibration on Sun Aug 09, 2015 10:34 pm

duck

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If you look in the parts catalog there are four foam bushings you can install between the back of the mirror glass and the housing.

Another thing I've done is put a bunch of wheel weights on the back of the mirror glass to increase the mass of it, thereby decreasing the resonant frequency.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

4Back to top Go down    Sagging mirror fix on Fri Jan 06, 2017 6:55 am

AL-58

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My scrapheap project RT has always had sagging mirrors, ie they never stay where I want, they drop while riding to just below where I want them.

I thought of a possible fix and so far its working.  I removed the glasses and covered the "balls" with fingertips cut from light rubber gloves before clipping the glasses back in. The extra thickness of the glove material and the grippy rubber texture still allow adjustment but my mirrors now hold their position. As a bonus most of the vibes/blurriness seems to have disappeared also.

At the same time, both of my mirrors have flat glasses but one of my spare RS mirrors had a convex glass(which I'd prefer), so I removed the convex glass from the RS backing and fitted the RT mirror backing with that mirror glass.

Question: if both the RS and RT mirrors have the same shaped mirror glass, what is the point of having different mounting bases?

Al



Last edited by AL-58 on Fri Jan 06, 2017 8:15 am; edited 1 time in total


__________________________________________________
'87 K100RS/HRD sidecar (1100 motor)  sc25 
'92 K100RS-16v (Paint it Black)

'87 K100RT with Paralever backend

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

    

5Back to top Go down    Re: Mirror Vibration on Fri Jan 06, 2017 7:35 am

BobT

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99% certain that a mounting somewhere will be loose. Could be fairing or mirror. As your bike is a 16v does it have the correct mirror mountings with the spacers?

    

6Back to top Go down    Re: Mirror Vibration on Fri Jan 06, 2017 8:05 am

92KK 84WW Olaf

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Those mirror pod mountings are very important.

A word of warning too. The mirror glass works on a ball and socket arrangement that swivels when you adjust it within the mirror housing.

DO NOT be tempted to lubricate it in any way with oil or any lubricant to get it to fit. If you do it stays loose and will not remain in position due to the fact that you end up with no friction in the ball and socket joint. How do I know this? A previous PO had replaced the mirror glass with lubricant........and they don't stay in position so I fitted some nice little very soft rubbers between the mirror edge and the housing to provide some friction.

Al-58 I suspect it was because they wanted the turn signals in the RS mirror pods [no room in the RS fairing?] but not in the RT mirror pods.


__________________________________________________
1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 58,645 now 60,500 miles
    

7Back to top Go down    Re: Mirror Vibration on Fri Jan 06, 2017 12:09 pm

Point-Seven-five

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Is the glass truly the same between both models?  If so that is great news as the RS mirrors are no longer available from BMW and there seems to be a dearth of them on the used market while RT mirrors are fairly plentiful.

How did you remove the mount without damaging the silvering on the back of the glass?

BTW, My RS has had a problem with losing mirrors in the past.  I turns out that the bushing in the housing is too long to allow that little wire keeper to fully seat in the groove in the mirror post.  A little work on the back of the mirror's ball joint with a file to allow it to settle further into the bushing corrected the problem.  An alternate fix would be to counter bore the bushing very slightly.


__________________________________________________
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
    

8Back to top Go down    Re: Mirror Vibration on Fri Jan 06, 2017 12:35 pm

BobT

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RS and RT mirror glass are the same part number so how can one not be available when they are the same? The dealers order by part number. Here is the info from realoem.com.

Part 46632307640 was found on the following vehicles:

    

9Back to top Go down    Re: Mirror Vibration on Fri Jan 06, 2017 1:08 pm

92KK 84WW Olaf

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That means all Ks with fairings have the same mirror glass, from K75 to K1/K1100. Good information that one.


__________________________________________________
1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 58,645 now 60,500 miles
    

10Back to top Go down    Re: Mirror Vibration on Fri Jan 06, 2017 2:48 pm

Ringfad

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Hi Olaf

Not quite correct

The mirror glasses are both different

46631455000 is the part number for LT/RT

46632307640 is the part number for RS

K1's have mirrors attached to the bars not on the fairing.

These mirrors still seem to be both available from Motorworks

http://www.motorworks.co.uk/vlive/Shop/Parts.php?T=5&NU=15&M=40&Ct=NG&SbCt=BA_15_40_NG_20

Unfortunately the RS ones are the most expensive


__________________________________________________


   ;BMW; K100RS Style Black 1987 105K Km     ;BMW; K1 Black 1993 51K Km     ;BMW; K1100RS Red 1993 70k miles  ;BMW; K100 16V Black (ex ElectricMonk)
    

11Back to top Go down    Re: Mirror Vibration on Fri Jan 06, 2017 3:38 pm

Point-Seven-five

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Did you notice that Motorworks has no link to purchase the RS mirror?  The Max BMW fiche shows these mirrors to be on back order for well over a year with no expected delivery.  Basically, they have been discontinued, as have the turn signal lenses. 

This is why I ask how to remove the glass from the frame without damaging the silvering.


__________________________________________________
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
    

12Back to top Go down    Re: Mirror Vibration on Fri Jan 06, 2017 4:56 pm

AL-58

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@Ringfad wrote:Hi Olaf

Not quite correct

The mirror glasses are both different

46631455000 is the part number for LT/RT

46632307640 is the part number for RS

The RS and RT/LT have the same shaped mirror glass, but the plastic backing is different for each. My convex mirror glass from an RS mirror fitted my RT mirror backing perfectly.

As for removing the glass with damaging the silvering, it was attached with a large patch of doubled sided adhesive with a white foam core.  Judicious use of a long thin hobby knife cut throughwithout touching the mirror backing.

As for RS mirror glasses, I got all the stock from Motohansa when they closed so I have some in my personal stock.  I did not sacrifice one of the new ones to fit to the RT.

Al


__________________________________________________
'87 K100RS/HRD sidecar (1100 motor)  sc25 
'92 K100RS-16v (Paint it Black)

'87 K100RT with Paralever backend

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

    

13Back to top Go down    Re: Mirror Vibration on Fri Jan 06, 2017 5:23 pm

Ringfad

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Thanks AL

Now I understand (never having seen an LT mirror)

The part numbers refer to the complete glass and plastic backing plate that fit in the pod.

Great tip to know as I have lost a few RS mirrors in my time and they are expensive if not now impossible to replace.

Now to eBay looking for cheap LT/RT mirrors


__________________________________________________


   ;BMW; K100RS Style Black 1987 105K Km     ;BMW; K1 Black 1993 51K Km     ;BMW; K1100RS Red 1993 70k miles  ;BMW; K100 16V Black (ex ElectricMonk)
    

14Back to top Go down    Re: Mirror Vibration on Fri Jan 06, 2017 5:48 pm

BobT

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How come they all have the same part number then???

    

15Back to top Go down    Re: Mirror Vibration on Fri Jan 06, 2017 7:14 pm

Point-Seven-five

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The part numbers are different:

RS  46 63 2 307 640

RT/LT  46 63 1 455 000

These numbers were taken directly from the BMW fiche.  The parts are not interchangeable because the mounting of the glass to the housing is different for the two different mirror assemblies.

I can't explain why Real OEM has the information they have.  It appears from the pricing they show, they are woefully out of date.



Last edited by Point-Seven-five on Fri Jan 06, 2017 7:16 pm; edited 1 time in total (Reason for editing : spelang arrer)


__________________________________________________
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
    

16Back to top Go down    Re: Mirror Vibration on Sat Jan 07, 2017 6:03 am

AL-58

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@BobT wrote:How come they all have the same part number then???

I can assure you that the RS and RT/LT mirrors are not interchangeable.  Glasses are the same shape is the only similarity, The way the plastic backing fits into the mirror body is different for each.

Al


__________________________________________________
'87 K100RS/HRD sidecar (1100 motor)  sc25 
'92 K100RS-16v (Paint it Black)

'87 K100RT with Paralever backend

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

    

17Back to top Go down    Re: Mirror Vibration on Sat Jan 07, 2017 6:25 am

RicK G

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VIP
VIP
This is from Real OEM

RT/LT Part#   46631455000
RS Part#       46632307640

Where on earth did you get that from Bob?


__________________________________________________
If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

18Back to top Go down    Re: Mirror Vibration on Sat Jan 07, 2017 8:28 am

Ringfad

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Part 46631455000 was found on the following vehicles:

·       K589 (K 1100 RS, K 1100 LT)   (06/1989 — 04/1999)

·       K589 (K100, RS, RT, LT)   (10/1983 — 10/1991)

·       K569 (K 75, K 75 c, K 75 s, K 75 RT)   (01/1989 — 06/2005)

Part 46632307640 was found on the following vehicles:

·         K589 (K1, K 100 RS)   (03/1989 — 06/1992)

·         K589 (K 1100 RS, K 1100 LT)   (04/1992 — 12/1996)

·         K589 (K100, RS, RT, LT)   (05/1983 — 10/1989)

RealOEM is good but cannot be trusted  Rolling Eyes

So before any more confusion as said before

RT/LT Part#   46631455000
RS Part#       46632307640

and to get back to the initial query I suffered the vibration issue on a few RS's and it was down to the mirror not being correctly located in the pod and the wire circlip not being fitted at the back.


__________________________________________________


   ;BMW; K100RS Style Black 1987 105K Km     ;BMW; K1 Black 1993 51K Km     ;BMW; K1100RS Red 1993 70k miles  ;BMW; K100 16V Black (ex ElectricMonk)
    

19Back to top Go down    Re: Mirror Vibration on Sat Jan 07, 2017 9:22 am

BobT

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Funny that the Germans also think that they are the same see:
http://www.kfm-motorraeder.de/cms/en/genuine-spare-parts/bmw-spare-parts?itemid=46632307640

I think that you will find that BMW used this item to supersede 46631455000. Which went out of production in 1993.

    

20Back to top Go down    Re: Mirror Vibration on Sat Jan 07, 2017 10:25 am

RicK G

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VIP
The K1100RS used the same mirror glass that the K100 RS used so that isn't right.


__________________________________________________
If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

21Back to top Go down    Re: Mirror Vibration on Sat Jan 07, 2017 11:12 am

Point-Seven-five

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@BobT wrote:Funny that the Germans also think that they are the same see:
http://www.kfm-motorraeder.de/cms/en/genuine-spare-parts/bmw-spare-parts?itemid=46632307640

I think that you will find that BMW used this item to supersede 46631455000. Which went out of production in 1993.

Bob, aftermarket parts sellers are the last people I would trust as to advice on part interchangeability.  I mean, do you really think that the k100rs mirror is actually used on the K1?  Really? 

Right now I am trying to sort out a clusterduck with a helmet dealer over cheek pads for a brand new helmet.  People who have no hands-on experience with a product and rely on third or fourth hand information are easily confused and create further confusion in a geometric progression.


__________________________________________________
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
    

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