BMW K bikes (Bricks)


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jjefferies

jjefferies
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Everyone who owns an early K100 or K75 probably has seen the rubber Bump Stop for the Center and side stands:
Bump Stop for Center and Side Stand BMW K Bike Origin10
These are fine as long as they work. But you see the two rubber nipples that hold them in place. To me these seem to always get ripped off leaving the bumper dangling and of no use. I've tried gluing them in place to no avail. And a new one is USD $32. which sorry seems a rip off to me. So when this last happened with Silver and I lost the bumper I found an old one which had had both rubber nipples ripped off and modified it by drilling a very small hole through the rubber and using 5mm. screws inserted through the holes and held in place with epoxy. The heads of the screws are buried in the rubber. Here they are

Bump Stop for Center and Side Stand BMW K Bike Modifi10
Bump Stop for Center and Side Stand BMW K Bike Modifi11
Hopefully these will last a bit longer.
best regards
J.

    

2Back to top Go down   Bump Stop for Center and Side Stand BMW K Bike Empty Nice fix! Wed Aug 24, 2022 11:24 pm

dbier

dbier
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Nice fix - thanks for posting!

    

3Back to top Go down   Bump Stop for Center and Side Stand BMW K Bike Empty Update Thu Aug 25, 2022 12:13 am

jjefferies

jjefferies
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Life time member
So I thought I had it figured until I found I had to clean the epoxy off the threads. Yeeech! And I pulled one screw out just cleaning it. So what I did was to put a washer under the head and then using a hand drill with a philips head drive on it and screwed the screw back into place. Then added epoxy behind the head. It was a brute force approach but it worked. Then under the machine to install it. That wasn't as bad as I thought it would be. But found that varied actions involving the muffler (the bumper mounts to the muffler) had pushed things off true. The side stand fits in quite comfortably. But the center stand isn't quite centered. Probably means the muffler is off a bit. BTW, as it turns out, I had worried what if the screw head isn't fully buried in the rubber. Not a problem. As near as I can tell it wouldn't make a bit of difference if the stands were resting against the screw head.

    

duck

duck
Life time member
Life time member
I just use zip-ties when the nipples of those bumpers fall off.  Quick, cheap and easy.

It's a ghetto repair but it works and nobody can see it so I don't care.


__________________________________________________
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
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

jjefferies

jjefferies
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Life time member
Any chance you could show us how you tie them on? Do you go through the rubber or just around the bits? Seriously curious. I agree no one is going to get down there and check. But does the fix hold or do you eventually lose the rubber?

    

duck

duck
Life time member
Life time member
jjefferies wrote:Any chance you could show us how you tie them on? Do you go through the rubber or just around the bits? Seriously curious. I agree no one is going to get down there and check. But does the fix hold or do you eventually lose the rubber?

No pics but I just put a zip-tie over the low point in bumper curve around the bracket on the exhaust. At first I was concerned that the heat of the bracket might melt the zip-tie but then I figured that if it didn't melt the OEM rubber then it probably wouldn't melt a nylon zip-tie either.

I've done this on a few Ks with no issues.


__________________________________________________
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
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

Karl P H

Karl P H
active member
active member
Ditto the zip tie solution for me  Used one big fat heavy duty one, no drilling.

Karl


__________________________________________________
Pearl White K100RS (16v) (1992)
Dolphin Blue R1100R (1997)

Previous
Alaska Blau K100RS (1985)
KZ750GT P2
CB400/4
CB250N
CB750/4 F2
CB360 T
CB200E
    

MikeyD

MikeyD
active member
active member
Mine was hanging loosely so I removed it before I lost it. My problem is that I put it in a "safe place" until I got around to securing it back on the bike and now I can't find it!


__________________________________________________
1985 K100RT (0052390), 1985 K100 (0030066), 2003 K1200GT (ZK01448), 1984 R65, 1984 R80ST, 1974 R90/6, 1976 R90/6, 1997 R850R, 1991 Honda CB250, 1998 Sportster 883
    

jjefferies

jjefferies
Life time member
Life time member
MikeyD wrote:Mine was hanging loosely so I removed it before I lost it. My problem is that I put it in a "safe place" until I got around to securing it back on the bike and now I can't find it!
Done the safe place thing, myself. Question to the general public, But that $32.00 piece of rubber is a bit pricey to my mind. Has anyone ever tried making one from an old rubber Tire. Just to look at it, I think I should be able to whittle something out of an old tire.

    

MartinW

MartinW
Life time member
Life time member
A mate of mine used to get tubes of silastic that had gone off  and carve out bushes and bump stops. I've also cast rubber parts using plasticine as a mold. 
Regards Martin.


__________________________________________________
1992 K75s
    

jjefferies

jjefferies
Life time member
Life time member
MartinW wrote:A mate of mine used to get tubes of silastic that had gone off  and carve out bushes and bump stops. I've also cast rubber parts using plasticine as a mold. 
Regards Martin.
That is a very interesting approach that I hadn't thought of. TAP plastics isn't that far away and I think they have most of the materials to make a mould. I only wonder how sturdy the resulting piece would be. Though undoubtedly cheaper than buying a single piece.

    

MartinW

MartinW
Life time member
Life time member
Apparently different types of silastic give different results. I'm not sure what type you would mold a stand bump stop out of. He got the silastic from the local council tip recycle shop, and I don't think they even charged him for them.
Regards Martin.


__________________________________________________
1992 K75s
    

fishboy316

fishboy316
Life time member
Life time member
MikeyD wrote:Mine was hanging loosely so I removed it before I lost it. My problem is that I put it in a "safe place" until I got around to securing it back on the bike and now I can't find it!
 Mine is the "I will put this here so I know where it is" spot. Then promptly walk away and forget it. If I could remember where that spot is I would have so many pieces of hardware and small tools that I would  never need to go to the hardware store again!

    

Point-Seven-five

Point-Seven-five
Life time member
Life time member
It normally happens that you will find the part you put in the "special" place about a month after you bought a replacement.  And... you will find it while you are looking for a different part...

That you will not find, either.


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

jjefferies

jjefferies
Life time member
Life time member
Well now that some one else has redirected the thread, I'll bring up my latest Score, Fasteners. You know how the little buggers get lost so d*mn easily. Put one down and it seems to sprout legs and run off. Anyway, my bud, Greg - BMWMOA ambassador - called the other day asking if I might have a spare K-75/K-100 fan. Well I went and looked and glory be I found one tucked in an out of the way place where it had been residing for the past 10 or 15 years. So with fan and plan in hand I rode down to his small shop and inquired what it might be worth to him or whoever he was helping out. Allowing that they ranged in value from USD $20-$150 he suggested $75. I countered with $50 AND all the excess fasteners he had tossed into a tub AND a couple of the used electrical busses laying in a box I knew of. The busses were of value even though they were a mix of mostly R but some K electrics but they had all the connectors on them. So the hard bargaining done I rode home with two cardboard boxes behind me. The fasteners were about 30 lbs and the busses were another 15.  Here is a shot of the fasteners laying out drying after I got them home and soaked them in a mix of dawn and simple green over night:



Bump Stop for Center and Side Stand BMW K Bike Nuts_n10

Now to sort them. Oh, I should mention one part of this not shown is all the rubber bits that were included. I'm forever in need of various rubber tidbits. Sadly no side stand/center stand bumpers were found. Apparently he pitches them.

    

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