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The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> Shock absorbor question
Post Info TOPIC: Shock absorbor question
apw99


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Shock absorbor question
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hi folks,

I need to replace the bump-stop on my rear shock. i have the spring off, which i am re-painting and need to take off the bottom mounts in order to fit the bump-stop. Looking at old threads which are more focused on total rebuilds I see that the shock stem can be held with a vice or pipe-wrench with some protection wrapped around the stem to prevent any damage. Then it seems that the bottom mount is then turned to unscrew the stem. That looks easy enough (famous last words!) but my question relates to the damping adjuster. If I remove the bottom mount will it cause an oil leak or de-pressurize the shock? I reckon the damping knob adjusts a shaft which passes through the shock shaft and mechanically adjusts the damping...am I right?

If so I suspect I can safely remove the bottom mounts and fit the bottom mounts.

Thanks!

APW



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TTRfan


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Hi APW

I have tried all ways to hold the damper rod in the past including vice and Mole grips. Both will damage the rod as the bottom mount is on real tight no

If you try wrapping or protecting the rod you just end up having less purchase on it.

However, if you confine your efforts to the area of the rod under the bump stop then any damage is unlikely to affect the action of the rod and its path through the seal head.

I took advice from an expert and ended up making a clamping piece out of aluminium which works really well.

See my thread here.

You won't de-pressurise the shock as the rod I show in my photos is "dry". The valve it operates is inside the top of the rod and protected from leaks by O rings.

 



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apw99


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Hi Brian,
It seems you came to exactly the same conclusion I was working towards. I was thinking of how I could maximize the surface area to grip, and using a softer material such as aluminium is perfect as the alloy will distort before the steel shaft...the design you show is exactly what I was trying to get to..perfect!
Yep - I think its worth spending the time to fabricate this tool, well worth having.
Many thanks!!
APW

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TTRfan


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I had to buy a bar of ali stock to make my holder so have some spare if you need it.

Brian



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apw99


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Hi Brian,
I actually managed to get a bit pretty easy. A friend works in a workshop and he found a piece in the scrap! Amazing luck. So it is being milled out today and hopefully have it tomorrow...the work goes on
Many thanks
APW

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