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  #1  
Old 12-05-2016, 06:19 PM
XMagnaRider XMagnaRider is offline
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Why Do My Rider Footpeg Springs Break So Often?

Once or twice a year, I have to replace a broken rider footpeg spring. They cost $9 each from the BMW dealer, and they are separate parts - different springs for the left and right side. I have owned my 2007 K1200GT since it was new. Here are my questions:

1. Why do my footpeg springs break so often?

I am gentle with my K1200GT. The only times that I can recall using the springs is when I am duck waddling to back up and my thighs bump into the footpegs. Occasionally the left peg bumps into me when I am pushing the bike from the side.

2. Do they break as frequently for you?

3. Do you have any suggestions about what I can do to keep them from breaking so often?

4. Do you have an alternate (read: less expensive) source for the springs?

Any advice would be appreciated.
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  #2  
Old 12-05-2016, 07:03 PM
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Re: Why Do My Rider Footpeg Springs Break So Often?

Having never even heard of a footpeg spring breaking, I'm wondering if the right parts are installed correctly?
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Old 12-05-2016, 07:24 PM
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Re: Why Do My Rider Footpeg Springs Break So Often?

interesting.. In all my years in this biz I've never heard of anyone breaking a footpeg spring on any bike... Guess that makes you kinda special...
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  #4  
Old 12-06-2016, 09:30 AM
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Re: Why Do My Rider Footpeg Springs Break So Often?

Quote:
Originally Posted by phxazcraig
Having never even heard of a footpeg spring breaking, I'm wondering if the right parts are installed correctly?
I am buying and installing the official BMW parts (left or right spring, as appropriate) from local BMW dealers.

As far as I can tell, there is only one way to install them. NOTE: written by XMR, not from any official source:

1. Remove the retaining clip (C clip).
2. Pull the pin.
3. Replace broken spring. There seems to be only one orientation that works. One end goes into a small hole on the frame to keep the spring in position.
4. Push footpeg in place. This will apply tension to the spring.
5. While holding footpeg in place, reinsert the pin.
6. Snap retaining ring in place at the end of the pin.
7. Done.

I have found that it helps to lubricate the pin with a small amount of spray grease to make it easier to insert and remove.

That's it. Yet they still break fairly often. Any more ideas? Please?
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  #5  
Old 12-06-2016, 09:41 AM
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Re: Why Do My Rider Footpeg Springs Break So Often?

not sure how you be breaking these springs, they are not that small and fragile, I don't see a left or right specific spring either, or at least it don't show in the fiche...

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  #6  
Old 12-06-2016, 10:26 AM
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Re: Why Do My Rider Footpeg Springs Break So Often?

The parts are:

46717681423 - Retainer Spring Left
46717681424 - Retainer Spring Right

My new left spring has two right-angle bends. Yours has only one. Yours appears to be a right spring.

(I tried to upload photos of the new spring, but the i-bmw website had issues and I don't use an online photo sharing service. I will try again later.)
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Old 12-06-2016, 10:40 AM
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Re: Why Do My Rider Footpeg Springs Break So Often?

sorry my bad, was looking at the wrong year of your bike

still the spring I found is not so much different, perhaps a talk with the dealership mechanics might yield a reason for the failure of the springs....?



.
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  #8  
Old 12-06-2016, 11:05 AM
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Re: Why Do My Rider Footpeg Springs Break So Often?

Do you normally keep the rider pegs up? I'd like to see pictures of the springs in place, in both up and down positions. Maybe that will give a clue.
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  #9  
Old 12-06-2016, 11:19 AM
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Re: Why Do My Rider Footpeg Springs Break So Often?

Quote:
Originally Posted by phxazcraig
Do you normally keep the rider pegs up? I'd like to see pictures of the springs in place, in both up and down positions. Maybe that will give a clue.
No. You can't keep the footpegs up. The retainer springs push the footpegs back to the normal horizontal riding position.

The footpeg hinge and spring are there so that the footpeg can move up if you are "dragging pegs" in a turn. (A rigid footpeg without a hinge might snag on the pavement and cause a high side accident.) The footpegs can also move up and out of the way if your legs bump into them, such as when you are waddling the bike backwards. The spring returns the footpeg to the normal riding position.

I will try to post photos here, but there is currently a problem with uploads. Hopefully we'll get it fixed soon, otherwise I will find another way.
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  #10  
Old 12-06-2016, 11:51 AM
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Re: Why Do My Rider Footpeg Springs Break So Often?

OK, let me make some 'educated' guesses. First guess, these a 'pusher' spings rather than 'springs under tension from pulling, like coil springs'. Second guess, these springs are breaking at a right angle bend.

Since this is so unusual, and consistent, unless installed incorrectly (somehow under too much pressure), something is weakening the springs to cause them fail. If so, two thoughts come to mind.
1. chemicals - do ride where road salt is applied for snow?
2. vibration - do your footpegs have a lot of vibration?

If either of these seems possible, perhaps you could have a new set of springs anodized against corrosion, and mounted with some sort of rubber bushings that reduce vibration.
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  #11  
Old 12-06-2016, 04:17 PM
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Re: Why Do My Rider Footpeg Springs Break So Often?

I was able to upload the image files. The problem was the i-bmw website was rejecting my uploads earlier today. When I tried again this afternoon, it worked.

There are two images of the replacement left footpeg spring part, and there are two images of the working right footpeg spring. One is is the normal footpeg down for riding position. The other is in the rotated out of the way position.

P.S. Before anyone else comments, here are two additional pieces of information:

1. I ride with the Verholen peg lowering kit. I note that the attachment is identical to the one on the motorcycle, but perhaps its lower, more forward position has something to do with the issue. Sorry I forgot to mention it earlier, but I take it so much for granted that I simply forgot.

2. To answer Craig's question:
The springs always break at an arbitrary place somewhere in the middle of the coil; they never break at the right angles near the ends of the spring. The spring is a torsion spring. The spring forces are along the circumference of the coil trying to tighten the coil itself; the coil loosens as it rotates the footpeg back into position.

Here are the images:








Thanks again to those who offered to post the images on their own social media or personal websites.

P.S. - I am still having problems with images. They don't appear inline, and they appear as small generic icons, so I changed them to ordinary links. Hopefully you can see them.

(OK, one for you. When you post the photo's URL you must place the URL between these markers [img][/img] - Craig "CJS350")
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  #12  
Old 12-06-2016, 05:58 PM
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Re: Why Do My Rider Footpeg Springs Break So Often?

Here's the other photos







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  #13  
Old 12-06-2016, 07:19 PM
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Re: Why Do My Rider Footpeg Springs Break So Often?

The only other thing I could think of is if the bike (i.e., the foot peg spring) is exposed to some chemical that causes the spring steel to become brittle. I have no idea what that would be but I've never in my life ever heard of a spring steel failing.

Kent
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  #14  
Old 12-08-2016, 11:58 PM
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Re: Why Do My Rider Footpeg Springs Break So Often?

have you compared the Verholen pegs back to your factory ones to see if any dimensions for the attach points changed?
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  #15  
Old 09-29-2018, 10:22 AM
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Re: Why Do My Rider Footpeg Springs Break So Often?

Quote:
Originally Posted by Super8MM
have you compared the Verholen pegs back to your factory ones to see if any dimensions for the attach points changed?
Good question. The answer is yes. I returned the footpegs to factory settings last summer (2017). I removed the Verholen footpeg extenders when I got a set of highway pegs for my K1200GT from Ken Estrada. It didn't help.

A few days ago, the left footpeg spring broke. Again. I believe that the problem is related to pushing on the footpeg springs when I "waddle" the motorcycle to back it up. I don't understand why it happens to me so often, but does not seem to happen to others. When I picked up a replacement spring, I ordered two more springs, one left, one right. I will store them under the seat somewhere, so they will be ready whenever I need the next one.

I sprayed both springs with Boeshield when I replaced the broken one yesterday. Boeshield is a waterproof lubricant and protectant developed by Boeing. It is used by woodworkers to protect their tools from friction and rust, which is how I learned about it. It contains solvents (lubricants) and some kind of protective wax. We'll see if it helps, and hopefully road grime won't stick to it. Neither footpeg spring was dirty or grimy when I sprayed them.
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  #16  
Old 09-29-2018, 11:36 AM
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Re: Why Do My Rider Footpeg Springs Break So Often?

Hi,

Can you elaborate as to the nature spring failure?
Perhaps this will offer some clues to help us determinie root cause.

Torsion springs in particular would be susceptible to any nicks on the outside diameter which could cause premature failure.

Have the springs you are replacing all failed in the exact same place?
Perhaps there is a small pinch point causing any nick in the spring where crack propagation can occur rapidly?
Post some pics of the broken spring if you have any and perhaps we can assist.

Joe
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Old 09-29-2018, 08:02 PM
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Re: Why Do My Rider Footpeg Springs Break So Often?

Quote:
Originally Posted by Jnovak01
Hi,

Can you elaborate as to the nature spring failure?
Perhaps this will offer some clues to help us determinie root cause.

Torsion springs in particular would be susceptible to any nicks on the outside diameter which could cause premature failure.

Have the springs you are replacing all failed in the exact same place?
Perhaps there is a small pinch point causing any nick in the spring where crack propagation can occur rapidly?
Post some pics of the broken spring if you have any and perhaps we can assist.

Joe
Great questions, Joel.

I have not looked for sharp edges or protrusions that might be nicking the springs. I note that they fail on both sides equally. They don't seem to fail for others with the same KGT motorcycles.

I am not sure about whether they are breaking in the same place or not. I will start taking notes.

The failures happen about once every 18 months or so, which means that a given spring probably lasts 3 years before breaking. I bet that I have replaced about 6 springs so far, since I bought the K1200GT new in 2007.

I am posting a photo of the latest broken spring, from the left footpeg.
Attached Images
File Type: jpg K1200GT 2007 Broken Left Footpeg Spring.JPG (43.3 KB, 13 views)
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  #18  
Old 09-30-2018, 08:14 AM
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Re: Why Do My Rider Footpeg Springs Break So Often?

If you are buying your springs from the same dealer is it possible that there is a bad batch of springs with manufacturing/heat treatment faults and it is nothing that you are doing wrong
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Old 09-30-2018, 09:16 AM
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Re: Why Do My Rider Footpeg Springs Break So Often?

I still find this to be the most baffling issue on a BMW that I've ever heard.. These springs continually breaking would seem theoretically impossible.. We all must be missing something here..

If you ever do find the reason.. you MUST let us know...
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Old 09-30-2018, 09:29 AM
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Re: Why Do My Rider Footpeg Springs Break So Often?

Quote:
Originally Posted by Capt Howdy
If you are buying your springs from the same dealer is it possible that there is a bad batch of springs with manufacturing/heat treatment faults and it is nothing that you are doing wrong
Good thought, but no, I have not bought them all from the same dealer. Furthermore, most of the time they are special ordered. It takes a few days for the part to come in.

When I went in to the dealer to pick up this spring, I decided to order a spare left and right springs. This way, when the next footpeg spring breaks, I won't have to wait for the order.
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  #21  
Old 09-30-2018, 02:06 PM
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Re: Why Do My Rider Footpeg Springs Break So Often?

I would guess there is no way the springs can fit on the opposite sides? I would also think the springs could not be under much tension in their down state.
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Old 10-01-2018, 10:34 AM
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Re: Why Do My Rider Footpeg Springs Break So Often?

Thanks for the pic.



If I had the spring we could take a look at the microstructure and post test the area of breakage to determine root cause.

Since I don't have that luxury here are my thoughts.


Let's assume the springs were made correctly.


If the springs are breaking in the exact same place it could be that there is something that is pinching the wire which would produce a point of crack propagation. Take a magnifying glass and look at the area of breakage. Look for a small defect or depression in the wire around the breakage as if someone may have pinched the wire. The evidence of outside diameter deformation can help us determine if the spring was pinched somehow.
If the springs are NOT breaking in the same place - and again assuming they were made correctly - it would give me reason to think that the springs are being stressed above their design limit which would lead to drastically reduced life or immediate failure.


Let me inquire as to exactly when are the springs breaking.
You mentioned you use the pedals to "waddle" the bike. Could you elaborate as to what exactly this activity is and how it is performed? Maybe this can give us some clues.


Hope this helps.


Joe
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