Torque 1125 steering head bearings & fix the front end clunk

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fozberry

Torque 1125 steering head bearings & fix the front end clunk

Postby fozberry » Thu Sep 16, 2010 3:17 pm

My 1125R started exhibiting the annoying front end clunk after about 3000 miles. I did a load of trawling around the BadWeatherBikers forum, and the general conclusion is that the steering head bearings needed re-torquing (sp?), so today I've gone and done it.

Now I know that all the information I present here is available elsewhere, but since I couldn't spot anything on UKBEG, I thought it was worthwhile adding some instructions to the How To section. I have blatantly stolen the ideas from BadWeatherBikers, but the words, pictures, etc. are my own.

Before you start, it's important to note that to perform this job correctly you need to be able to get the front wheel off the ground whilst also removing all pressure from the forks, so you can't put your bike on a front paddock stand. I'm sure there's a thousand different ways of doing it, but here's what I did with the tools I had available:
Image

That's just an ordinary car jack that I've had in my garage for years. I think I actually bought it at a car boot sale for 50p, and I've used it hundreds of times since. It lifts my bike up very well, with the bike remaining reasonably stable all the time, although it does tend to lift the rear wheel rather than the front, so while you're doing the job you just need to put a little bit of pressure on the back of the bike to lift the front up. I'll leave it up to you to decide whether you've got a better way to do it than this, but this was adequate for me.

Now you just need to gather your tools together before getting started. Here's what I used:
Image
  • Torque wrench (if you've not already got one, get a fairly decent one, preferably in 3/8" drive and capable of going as low as around 10 ft lbs, not like the cheap and crappy 1/2" drive one I have!)
  • Metric and AF 3/8" square drive allen bits. Specifically you need a 3/8" bit for the stem nut and a 6mm bit for the pinch bolts.
  • Ordinary metric and AF allen keys (it's a bit tight in there, and I found the allen keys just made life that little bit easier.)

Right then, we're ready to begin.

1) With the bike still fully on the ground, loosen off the steering stem pinch bolt. 6mm allen key.
Image

2) Now loosen the lower triple clamp (or yoke if you're old fashioned like me) pinch bolts. 6mm allen key. 2 bolts on either side.
Image

3) Loosen the steering stem nut. 3/8" allen key.
Image

4) Jack your bike up far enough so that the front wheel doesn't contact the ground with the steering at full lock on either side.

5) Torque the steering stem nut to 38-42 ft lbs.

6) Torque the fork pinch bolts to 20-21 ft lbs.

7) Torque the steering stem pinch bolt to 20-21 ft lbs.

8) At this stage you're supposed to check bearing wear by measuring the amount of force it takes to turn the bars. This is done by attaching a spring scale to the front axle, and using it to pull the wheel back to the centre position, anything up to 7 lbs of force is apparently fine, any more than that and the bearings are screwed. I don't have a spring scale, so I just felt the resistance in the bars and it seemed fine.

9) Lower the bike back down, get your leathers on and go out for a ride.

That's it. It only takes about half an hour to do, probably a lot less if you've done it before.

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Adam
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Re: Torque 1125 steering head bearings & fix the front end c

Postby Adam » Thu Sep 16, 2010 5:43 pm

Personally, I think the spring balance thing is bollox. With no cables etc attached, I've found letting the wheel fall slowly to the lock stops works quite well.
If your dreams don't scare you, they are not big enough.

fozberry

Re: Torque 1125 steering head bearings & fix the front end c

Postby fozberry » Thu Sep 16, 2010 9:02 pm

Adam wrote:Personally, I think the spring balance thing is bollox.

Couldn't agree more. Surely it's fairly obvious if the steering's too stiff. I suppose they have to quantify things though instead of saying 'if it feels a bit too firm...'

Guilhem0018

Re: Torque 1125 steering head bearings & fix the front end c

Postby Guilhem0018 » Tue Nov 29, 2011 3:39 pm

And what about the 1125 CR?

Avalaugh
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Torque 1125 steering head bearings & fix the front end clunk

Postby Avalaugh » Wed Nov 30, 2011 11:55 am

Don't think you need to loosen the lower yoke pinch bolts.

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Maz
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Re: Torque 1125 steering head bearings & fix the front end c

Postby Maz » Wed Nov 30, 2011 1:33 pm

Yes you do........think about it ! :roll:
Mithered ta death.
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richie
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Re: Torque 1125 steering head bearings & fix the front end c

Postby richie » Wed Nov 30, 2011 6:19 pm

Yet another 'brain fart' .....jesus :rotfl:
xxxx

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Torque 1125 steering head bearings & fix the front end clunk

Postby Avalaugh » Wed Nov 30, 2011 7:24 pm

Following the above steps, why do you need to loosen lower yoke pinch bolts ? The forks are still installed, so the weight of them is still present, may as well leave them pinched in place.

To torque to the correct level you would need to remove the forks, or at least take there weight off from the stem.

Not trying to be a smart ass, just trying to help !

Enlighten me...

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Maz
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Re: Torque 1125 steering head bearings & fix the front end c

Postby Maz » Wed Nov 30, 2011 8:46 pm

:headbang: ........I'm gonna give someone else the chance to point out basic principles here.......I've had a good day and dont want to spoil it by being abusive.....
Mithered ta death.
92 MB
96 S2T
98 S1W
00 M2
01 X1
03 P3
10 CR

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DrBuella
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Re: Torque 1125 steering head bearings & fix the front end c

Postby DrBuella » Wed Nov 30, 2011 9:45 pm

As the yanks say......"what gives?"
aka DrBagiva, DrBusqvarna, Uncle Knobhead

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kevmean
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Re: Torque 1125 steering head bearings & fix the front end c

Postby kevmean » Wed Nov 30, 2011 10:00 pm

Ok ....so you're trying to basically pull the yokes closer together........so centre clamp on top yolk undone to allow the stem to pull through as you torque the centre nut .............If you don't allow the lower yoke the freedom to slide up the fork legs you'd have to bend either the top or bottom yolk to get the bearings closer together ;) .............so best to undo the lower yolk clamp bolts ;)
2001 X1 2009 1125CR 2006 Uly X3 2010 Uly a fully Maz'd S1 and a 1991 RS1200 Westwind.

Avalaugh
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Torque 1125 steering head bearings & fix the front end clunk

Postby Avalaugh » Wed Nov 30, 2011 10:47 pm

If you've undone the top yoke pinch bolts, the forks will slide up into them, not bend or damage anything ?

Never had an issue doing it like this on any of my bikes !

Not saying you should install components like this, but in this instance it will be fine for re-torquing the head bearing.

Avalaugh
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Torque 1125 steering head bearings & fix the front end clunk

Postby Avalaugh » Wed Nov 30, 2011 10:50 pm

Unless your forks are pushed through the yoke to the split ring stop. But your only moving things micrometers !

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kevmean
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Re: Torque 1125 steering head bearings & fix the front end c

Postby kevmean » Thu Dec 01, 2011 2:45 am

Avalaugh wrote:If you've undone the top yoke pinch bolts, the forks will slide up into them, not bend or damage anything ?

Never had an issue doing it like this on any of my bikes !

Not saying you should install components like this, but in this instance it will be fine for re-torquing the head bearing.

In the original post though it didn't mention undoing the top pinch bolts + the top is the located position of the forks so doesn't really want moving .
2001 X1 2009 1125CR 2006 Uly X3 2010 Uly a fully Maz'd S1 and a 1991 RS1200 Westwind.

Avalaugh
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Torque 1125 steering head bearings & fix the front end clunk

Postby Avalaugh » Thu Dec 01, 2011 8:23 am

Ah I see, so my way does work, 6 of one, half a dozen of the other :)


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