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The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> 'Jamming' rear suspension
Post Info TOPIC: 'Jamming' rear suspension
66T


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'Jamming' rear suspension
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Hi all. After years and years (and years) of motorbiking and fiddling around with same, I find I'm still a noob.

Some while ago, at about 70,000 km I replaced all the linkage bearings. When all is said and done, I eventually replaced the shock, as it was badly worn, and the suspension appeared not to be getting full travel. And it still isn't, in spite of trying several different springs. 

So. New shock, new bearings all around and not getting travel beyond about 1mm above the bump rubber on the shock shaft. What on earth have I done wrong? It all appears to be as per the manual confuse.



-- Edited by 66T on Sunday 16th of November 2014 07:02:21 AM

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petenz


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Dose the swing arm travel right though it's stoke if you remove the shock ?
Dose the shock fully compress with the spring removed ?

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TTRfan


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It sounds really odd.

I have found that the rear shock will "jam" if the rebound clicker is wound in too far.

Check that it is in the standard "9 clicks out" position to see if that cures the problem.

Adjusting rear shock Pt 1.jpg

Adjusting rear shock Pt 2.jpg

Adjusting rear shock Pt 3.jpg



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66T


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Thanks for your replies.

I have had the old shock and new shock in place (obviously), and no, the full stroke isn't being used. I can't see why. I haven't taken the new shock back out to check full and free travel of the s/arm yet.

The clickers are actually backed out more that 9 clicks ie 18.

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TTRfan


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It's worth trying the clickers on the standard setting of 9 as 18 sounds a tad extreme. 



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66T


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Hmm. There are 40 clicks between max and min rebound according to your w/s manual post. But my w/s manual says min rebound is 16 clicks out. Obviously I can't count and feel foolishconfuse



-- Edited by 66T on Thursday 20th of November 2014 05:39:51 AM



-- Edited by 66T on Thursday 20th of November 2014 05:50:37 AM

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66T


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Well, there's one born every minute...

I've discovered the shock clevis only fits on the relay arm one way. I had it on the wrong way, which jams the suspension just before the bump rubber. The workshop manual doesn't specify this, and I was too dumb to pick up on it. Sigh.

Problem solved, thankfully.



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Cubber


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Very satisfactory - ultimately. aww

It looks like you were in a "cleft stick" or "cleft clevis" situation. cry

At least we all know NOW to look at everything the right way round now and not presume things.

Thanks for the knowledge. wink

Martyn



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66T


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Ha ha mate!

I do have some defence, though. My TTR workshop manual clearly shows the bottom shock bolt inserted from the right hand side, and there is some evidence in the illustration that the concave machining is to the rear, which it has to be if the bolt is fitted that way.

This is wrong, as I've explained. The bolt must be inserted from the left, as the thread is on the r/h side of the clevis.

Oh well, that's done to death now, so I can move on!



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TTRfan


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66T wrote:

Oh well, that's done to death now, so I can move on!

Not so sure - room for doubt as all the shocks I have fitted has the bolt going in from the RH side confuse

Does your clevis look like in the pic below?

Can't let this one drop until we have nailed it wink

Fitting a lowering link (3).jpg



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locky


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Made me paranoid now, i'll have to check how i refitted mine.

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TTRfan


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locky wrote:

Made me paranoid now, i'll have to check how i refitted mine.

 biggrinbiggrinbiggrinbiggrinbiggrinbiggrin



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66T


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TTRfan wrote:
66T wrote:

Oh well, that's done to death now, so I can move on!

Not so sure - room for doubt as all the shocks I have fitted has the bolt going in from the RH side confuse

Does your clevis look like in the pic below?

 Yes, it does. 

However, I removed the shock, removed the spring, refitted the shock and found that the suspension jammed a bit before the bump rubber.

I turned the clevis around (ie bolt inserted from the left), and tried again. Result was full and free travel. So I guess it stays there.

Interestingly, the spares manual shows the bolt on the left. Weird.

I haven't been for a ride yet, but that will really prove the fix - or not!



-- Edited by 66T on Monday 22nd of December 2014 03:00:46 AM

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TTRfan


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You are right about the manual! It shows the bolt coming in from the left.  But it also shows the clevis cutout facing to the rear - confusing eh?

Rear shock clevis.jpg



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locky


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My bolt is fitted from the left.

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66T


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TTRfan wrote:

You are right about the manual! It shows the bolt coming in from the left.  But it also shows the clevis cutout facing to the rear - confusing eh?

 

 Yes, I reckon!! Oh well, whatever works, I suppose. I would've bet good money that I had it correctly fitted, but it jams. After a long time, damage to my lower back (seriously, I roe it like that all day every day for two very long weeks at work, all cross-country), and a lot of money mucking about with springs and shocks, I'm older, poorer and marginally wiser😁😁😊



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