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What is a suspension bush?

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c-m
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Joined: 12 May 2006
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PostPosted: 14:56 - 28 Sep 2007    Post subject: What is a suspension bush? Reply with quote
I need a new one plus (shock absorber) for my NSR125-rk but have no idea what it is or looks like.
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b-f-c
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Joined: 06 Sep 2006
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PostPosted: 15:06 - 28 Sep 2007    Post subject: Reply with quote
Hetzer wrote:
It's where shock-absorbers and forks grow.


I thought it was a bouncy fanny Very Happy
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c-m
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Joined: 12 May 2006
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PostPosted: 15:09 - 28 Sep 2007    Post subject: Reply with quote
lol.

£32.79 for all 5 bushes on an NSR125r-k from Dave Silver

£79.99 for the rear shock Crying or Very sad
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lukamon
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Joined: 18 May 2007
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PostPosted: 15:28 - 28 Sep 2007    Post subject: Reply with quote
bushes stop vibration. say on the main swingarm bolt, there are 2 bushes, one at either end. usually about 700mm long by 50mm diameter, with a steel tube in the middle surrounded by rubber. unfortunnately the garage'll have to do this as they have to be compressed a LOT to fit onto the hole.
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c-m
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Joined: 12 May 2006
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PostPosted: 15:36 - 28 Sep 2007    Post subject: Reply with quote
That's fine, i'll buy all the parts needed and find a mechanic to fit it all. At the time he may as well do the fork seals and tyre valves too.
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veeeffarr
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Joined: 22 Jul 2004
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PostPosted: 15:48 - 28 Sep 2007    Post subject: Reply with quote
c-m wrote:
That's fine, i'll buy all the parts needed and find a mechanic to fit it all. At the time he may as well do the fork seals and tyre valves too.


Right, You have your shock absorber, which has an 'eye' that a bolt passes through to attach it to the bike

In that hole you will have a cylindical, hollow bearing called a needle roller bearing

https://www.globalspec.com/NpaPics/40/525_061420041448_ExhibitPic.jpg

Inside that bearing where the rollers are (You could put your finger inside it and twist, and the rollers would 'roll' and your finger would move round with no resistance) is a thick hollow tube

(The top left most item in this picture)

https://www.dewsproducts.com/Products/Bearing.jpg

In between the bearing and bush is a layer of grease, the main BOLT then passes through the hollow bit of the BUSH to attach it to the bike, this enables the joint to a) be securely fixed and b) rotate when the suspension is compressed.

Usually it's the bearings that need replacing, bushes sometimes get corroded and need repairing.

You don't need OEM bearings, take the old ones to a bearing factor and he will find you some new ones... "TOYO" are a good bearing manufacturer and there are a few others.

If you are lucky, the bearing serial will be on teh side of the needle roller.

You can get the new bearings pushed in by an engineering firm for pennies or you could construct a drawbolt assembly to get the new bearings in .
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c-m
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Joined: 12 May 2006
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PostPosted: 16:55 - 28 Sep 2007    Post subject: Reply with quote
Thanks for that.

The MOT failure says that the rear suspension bush has excessive freeplay and also that the rear shock has inadequate damping effect.
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veeeffarr
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Joined: 22 Jul 2004
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PostPosted: 17:04 - 28 Sep 2007    Post subject: Reply with quote
c-m wrote:
Thanks for that.

The MOT failure says that the rear suspension bush has excessive freeplay and also that the rear shock has inadequate damping effect.


Righto

I imagine you need new roller bearings then, they get mullered and you'll esentially have flattened rollers inside the bearing

You can check this yourself in future by raising the back wheel with a stand and pulling up on the wheel with moderate force, you'll feel it 'lift' a couple of mil, this means your bearings are knackered.

Unbolt the linkage and get those bearings out to have a look!

You can source second hand linkages with good bearings from ebay for £20-30. maybe more from a breakers, you might even get a shock thrown in with that.
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 17:40 - 28 Sep 2007    Post subject: Reply with quote
Hi

Plenty of bikes do not have roller bearings in the suspension linkages. Might well just be a steel bush running in a plastic bush. Trouble is that if not kept in decent condition the steel bush corrodes, and destroys the plastic bush.

All the best

Keith
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