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The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> Rear shock / linkage issue?
Post Info TOPIC: Rear shock / linkage issue?
Beagle


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Rear shock / linkage issue?
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Hey all... recently had a chain break on me and it got caught up between the front sprocket and the swing arm, mashed up the swing arm bearing cover and swing arm oil seal...

didn’t want to take the whole shock / linkage off to get to the damaged seal and cover, so I just unbolted the swingarm from the linkage, took out the swing arm pivot shaft, and that allowed me to move the swing arm enough to replace the oil seal and swing arm bearing cover...

put it all back together and now the rear shock is sticking. It’s as though the damping has been cranked up to high heaven - if I push the rear of the bike down it stays there, lift it up and it will very slowly sag a little, but stays higher than it should ... I’m pretty clueless when it comes to shocks so just wondering if any experts can offer advice and recommend some next steps / things to try?

cheers!



-- Edited by Beagle on Sunday 5th of August 2018 10:46:06 PM



-- Edited by Beagle on Sunday 5th of August 2018 10:47:18 PM

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TTRfan


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Hi Beagle.

It may be that you have accidentally turned the adjuster and need to get it back to where it was.

See here for how to do it. Don't worry that its headed Raid - scroll down to the diagram of the OE adjuster. wink

Brian



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Beagle


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Hi Brian, thanks for the heads up! Didn’t even realise there was adjustment beyond the gas compression damping! Looks like this was the issue... gave it a few turns and it sprung back into position... it seems very easy to turn - doesn’t click, just turns by hand very easily, which explains why it must have been turned by accident as I was messing with the swing arm... looking at the service manual it seems it should click?? In your infinite wisdom and experience is this something I should be worried about!?

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Beagle


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Scratch that... if I wind it all the way in it clicks about 5 or 6 times as I unwind it and then just smoothly unwinds... must be a little worn I guess?

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TTRfan


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The "click" is caused by the adjuster pin riding over the serrations in the adjuster - see photo below:

Shock lower adjuster showing clicker mechanism.jpg

The clicking will stop once the adjuster is screwed down below the point where the pin can exert pressure.

Brian



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Beagle


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Ahah! Blimey Brian... huge thanks for going to the trouble of making an image to demonstrate it so clearly! Makes perfect sense - I suspect that the pin is a little gummed up (with various bits of the somerset levels no doubt!) such that it’s not able to exert as much pressure as it would if it were able to move more freely... I’ve got to do the linkage bearings at some point so I’ll probably strip it down and give it a good clean then. Thanks again for all your help!

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ttboof


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Mine gummed up I like to give it a turn now and then the guy who rebuilt my shock showed me the difference in the click it's much more definite once the gas is at the correct pressure 



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TTRfan


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Dead right Les - to get the full range of "clicks" the shock needs to be gassed to the right pressure.

Brian



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Beagle


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Aah... so the disappearance of the click after five or so clicks could indicate that the shock could be a little low on pressure? Does the TTR run nitrogen in the shock? I'm guessing it's a bit of a faff to get it refilled...



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TTRfan


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Most motorcycle shops with attached workshops will be able to re-gas a shock absorber. Simple enough job with the right equipment. Best to ring around and ask. But if your shock is working to your satisfaction maybe just leave it. Check the chrome rod to see if it has any traces of oil on it which will indicate a leak. wink

Brian



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Beagle


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Thanks Brian... Chrome rod is clear of oil and the shock works well enough for me to plod around the lanes chucking mud everywhere, so will probably leave it for now

Thanks again for all your help!

 



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