BMW K bikes (Bricks)

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1Back to top Go down   Footrests Empty Footrests Thu Dec 06, 2012 7:05 pm

sidecar paul

sidecar paul
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I've been playing with footrests lately.

Some years ago I bought some stainless U brackets from 'bins for the outfit, but they don't have the 'bridge' which is the stop to keep the pillion footrest in position. Without it, the footrest flops to about 30* below horizontal when you put your foot on it. You can add washers, about 5mm of them, to the U bracket fixing bolt, but that's not an elegant solution, so for the outfit I made some stainless blocks. For the brackets I've just bought for the solo I've made the stops from acetal block as in the photo:-

Footrests Sam_0414

As 'bins and 'works don't have the early footrest rubbers, I assume they are NLA, so I looked at how to use the later rubbers on the footrests with the bolt on end weights.

Footrests Sam_0415

The left rubber is the early type, centre is the later and right is a modified later rubber to suit the early footrests. It's a simple mod, just cut through the rubber into the 'air gap' and create the step.

The end weights then clamp the rubbers in place.

Footrests Sam_0416

If you're really fussy, you could mill (or file) 1mm from each side of the weights and square out the top radius for a better fit........but we don't know anybody like that......do we?

Footrests Sam_0417

That sorts out the front footrests, but the pillion rests have another problem. Originally, they have a spring arrangement to hold the footrest in the up or down position. Now, with the later rubbers, the centre hole is not big enough to accomodate this spring assembly, so throw it away and use the springiness of the rubber for keeping the footrest where it should be, as per the later footrests.

Footrests Sam_0418

The main reason for wanting stainless U brackets is that when moving the footrests up and down with the original fittings, you have mild steel rubbing on mild steel and with the best will in the world, you will never stop things going rusty. So, of course, one needs to make some stainless pressure plates as well. Note that the early pressure plates (left) are a different shape to the later ones.

Footrests Sam_0419

Another detail that I've done is to drill out the alloy footrest pivot hole to 12mm and fit a bush, which is then clamped between the ears of the U bracket with an 8mm bolt. If (when) the bush seizes in the alloy, it's a simple job to remove the 8mm bolt and take the footrest into the workshop and press it out; unlike when the standard pin seizes and you have to take the whole cumbersome footrest plate off to get it to the press.

Footrests Sam_0420

So there we have an assembled pillion footrest and all the bits that make up the other one.

I know comberjohn will be thinking "why can't he leave things alone", (maybe he's right) but some of this might be useful to somebody. At least I've eliminated one more source of rust.cheers

I'm now looking at a way of preventing the front footrest pivot pins from seizing. Taking them apart and greasing them every year only works with hindsight and then it's too late!

Paul.


__________________________________________________
'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015) 
....No CARS never ever!
    

2Back to top Go down   Footrests Empty Re: Footrests Thu Dec 06, 2012 7:15 pm

Guest

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Guest
This is good. A good solution.

    

3Back to top Go down   Footrests Empty Re: Footrests Thu Dec 06, 2012 7:40 pm

88

88
Life time member
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An elegant solution Paul. Stainless looks very well too!
88


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Footrests Ir-log11 88....May contain nuts!Footrests Ir-log11

"The world is a book and those who do not travel read only one page." - St. Augustine from 1600 years ago & still true!

K1100LT 1992 - AKA Big Red
K1100RS - 1995. AKA Rudolf Von Schmurf (in a million bits)
K1/RS - AKA Titan (unique hybrid by Andreas Esterhammer)
    

4Back to top Go down   Footrests Empty Re: Footrests Fri Dec 07, 2012 2:19 am

MartyB

MartyB
active member
active member
Love your work mate.


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1985 K100RS (0085223) to naked
    

5Back to top Go down   Footrests Empty Re: Footrests Fri Dec 07, 2012 2:21 am

MT350Explorer

MT350Explorer
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Good work Paul!
Cheers
Dave


__________________________________________________
1991 K100 RS 16 valve
    

6Back to top Go down   Footrests Empty Re: Footrests Fri Dec 07, 2012 5:29 am

blaKey

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Yep, good work John!


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Neil
K100RS 1986 RED!

Dress for the ride and the potential slide.
    

7Back to top Go down   Footrests Empty Re: Footrests Fri Dec 07, 2012 6:37 am

TacKler

TacKler
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Paul,

Your timing is impecable. I've got the right rear footrest soaking in WD40, 'cause the bloody thing is seized. Left rear already replaced with stainless item.

Thanks for the good oil.

Dave.

    

8Back to top Go down   Footrests Empty Re: Footrests Fri Dec 07, 2012 9:23 am

charlie99

charlie99
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VIP
good work there paul ...im sure some will take this onboard...a nice solution indeed


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OFootrests Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

9Back to top Go down   Footrests Empty Re: Footrests Sat Dec 08, 2012 6:07 pm

sidecar paul

sidecar paul
Life time member
Life time member
The problem with the front pivot pin is that the rust corrosion seizes the pin into both the footrest arm and the plate. Forcing the footrest up usually moves the pin in the plate but leaves it solid in the arm. Just fitting a stainless pin is not a solution, as stainless and aluminium are a good combination for electolytic action (ie corrosion), especially if your roads are salted during winter, although barrier greases can help to delay seizure.

A better solution would be to isolate a stainless pin from the aluminium.

I had intended to make an acetal bush to fit around the front footrest pivot pin and drill out the footrest plate and arm to, say, 12mm; but today I had this simple idea to isolate the pin from the alloy. Idea

I used a 38mm length of heat shrink sleeving on the pivot pins, measured the resulting new diameter, (in my case 8.8mm, but it may vary with other types of heat shrink) and then drilled out the footrest arm and plate to 8.9mm. So now, as there are no dissimilar metals in contact, it shouldn't seize. cheers

Footrests Sam_0422

As the front footrests only move when the bike falls over,affraid, the sleeving shouldn't be subject to much wear.

Well, that ends my thesis on footrests. Footrests 4265249878

Paul.


__________________________________________________
'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015) 
....No CARS never ever!
    

10Back to top Go down   Footrests Empty Re: Footrests Sat Dec 08, 2012 6:13 pm

Inge K.

Inge K.
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Footrests Happy010


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

11Back to top Go down   Footrests Empty Re: Footrests Sun Dec 09, 2012 7:12 pm

ReneZ

ReneZ
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Good one!!


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Greetings from Florida! Having a 'new' K  :cyclops:    Surprised-o: 

Rene


BMW K100 - 1985 (0030029) Footrests Rain
BMW K1200GT - 2003 (ZK01223)
    

12Back to top Go down   Footrests Empty Re: Footrests Thu Dec 13, 2012 10:15 am

Erman

Erman
Gold member
Gold member
This is a very good idea. I was thinking grease, but this is much less messy.
Now there is the matter of getting the pins out...


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Bikes:

1984 BMW K1000RS

1984 Yamaha XJ750 Seca
    

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