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| chrisjose1913 |
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chrisjose1913
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Joined: 27 Dec 2012
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 Posted: 00:41 - 19 Aug 2015  Post subject: MOT pillion pegs |
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Hello I have a honda clr 125 (city fly) it's going in for an mot soon, sadly it's missing the rear pegs and hangers. i have read you can simply take out the rear seat and convert it to a single seat bike for it to pass the would help if my bike had to seats  . In my case the seat is all in one so removing the rear seat cannot be done without removing the seat all together, the bike is being converted to a dual sorting bike, any suggestions ? 
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| SQL |
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SQL
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| Vincent |
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Vincent
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Posted: 14:40 - 19 Aug 2015  Post subject: |
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| stinkwheel |
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stinkwheel
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| Posted: 17:07 - 19 Aug 2015 Post subject: |
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Fit a long bolt through the upper hanger mounting bracket with a bit of rubber hose slipped over it to cover any sharp edges/points.
Nothing says they have to be either comfortable or sensibly positioned, they just have to be present, securely attached and possible to get your feet on from the pillion position. Otherwise many sports bikes would fail with their little foam pad for a seat and knees under your chin footpegs.
An M8 spout bolt mounted head-out the way with a bit of 8mm ID rubber hose slipped over it and attached to the hanger bracket by a nuts either side looks pretty much meant. I've used this before.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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| stinkwheel |
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stinkwheel
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| Posted: 17:10 - 19 Aug 2015 Post subject: |
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Did you really, genuinely just suggest drilling a hole in the swingarm?  
Hard to tell if that was a deliberate troll.
OP, do not drill holes in your swingarm. Swingarm-mounted pillion pegs were actually a thing back in the 70's, and yes, your feet do go up and down over bumps BUT they were mounted on a bracket welded to the swingarm, not bolted through.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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| Vincent |
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Vincent
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| Posted: 17:36 - 19 Aug 2015 Post subject: |
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| stinkwheel wrote: |
Did you really, genuinely just suggest drilling a hole in the swingarm?
Hard to tell if that was a deliberate troll.
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It sounds drastic......and first thought is that it may affect the strength of the swingarm....but it doesn't. I saw this on a forum, it wasn't for footrests, can't remember what is was now.....but drilling a hole into a box section arm doesn't weaken it.......unless the hole is 40mm or similar of course. Some Yamaha box section arms actually come with holes drilled for chainguard and rubber damper. Other arms are also drilled and fitted with wellnuts for paddock stand bobbins.
EDIT: I think the case I saw this in was for a chain tensioner.
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| chrisjose1913 |
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chrisjose1913
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| Posted: 00:04 - 20 Aug 2015 Post subject: |
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Thanks for the advice, I have come up with a solution, I have ordered universal bolt on pillion pegs, I will mount them to the holes the hangers would have been bolted in.
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| delsol |
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delsol
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| Posted: 07:44 - 20 Aug 2015 Post subject: |
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For someone who obviously knows a bit about spannering.
Don't mess with structural members, leave that to somebody qualified in structural integrity, like MrGs1 (he's a bricky you know). |
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| stinkwheel |
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stinkwheel
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Posted: 09:39 - 20 Aug 2015  Post subject: |
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| Vincent wrote: |
but drilling a hole into a box section arm doesn't weaken it.......unless the hole is 40mm or similar of course. |
So wheree's the cut-off?
You assert a 40mm hole WOULD affect the structural integrity of the swingarm but a 10mm hole would not. What about a 20mm hole? Or a 30mm hole? Or a 39mm?
Then we get down the WHERE on the swingarm this hole is. Having installed bits and pieces of wiring/plumbing, you can safely drill quite a large hole through the centre of a joist because the stress and strain is borne by the very top and bottom of the joist. However, there are fairly strict guidelines for how large and how close together these holes can be which get more strict the further you get from a supported end.
So. We mutually accept that while you probably can drill a hole of some sort in a swingarm without drastically altering its structural integrity, there comes a point where that hole is so big it DOES and neither of us know what that point is.
I further assert that the likleyhood of structural failure increases, the further from a supported end you get. Because engineering.
There is a third point. A hole through a rectangular member will have a relatively small effect on integrity in the plane perpindicular to the hole. It will however have a much larger effect on the plane paralell to the hole. So a hole through the side probably wont have much effect on the vertical stiffness but it could compromise horizontal integrity.
Given we have three variables determining the likleyhood of a hole in the swingarm affecting structural integrity (size, distance from end and relative position) which neither of us appear to have the engineering knowledge to evaluate, your advice was bad. I can't definatively say it's unsafe any more than you can say it's safe.
I assert, with some basic engineering knowledge (obtained many years ago during my higher technology course which did cover stress/strain relationships, youngs modulous etc), that drilling a hole in a motorcycle swingarm to mount pillion footpegs may well be unsafe.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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| Vincent |
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Vincent
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| Posted: 10:25 - 20 Aug 2015 Post subject: |
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Aye...I think all these things were mentioned on the thread I saw originally which was more than likely on the RD/RZ forum. Most of the weight for the "yes" camp came from someone who claimed to have worked for Mechamex or the other famous custom arm maker whos name escapes me right now, he "OKd" the hole that was being discussed in the thread and talked a bit about where the strength comes from in a box section arm and why it wouldn't be affected by this particular hole then this was followed up by similar thoughts about drilling spar frames and how much you could drill one before it would be weakened structurally.
BTW....I was as shocked as you were when it was originally proposed...it just seemed an obvious "No No" 
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| Shinigami |
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Shinigami
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Old Thread Alert!
The last post was made 10 years, 317 days ago. Instead of replying here, would creating a new thread be more useful? |
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