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Unstable after hitting pothole

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DickVanWinkle
L Plate Warrior



Joined: 07 Jan 2014
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PostPosted: 16:29 - 18 Jan 2014    Post subject: Unstable after hitting pothole Reply with quote

Hi people, I think I've got a problem.

See, about a week ago, I tried to avoid a pothole in a corner, but the rear wheel still went in and I nearly came off.
Since then, the bike has felt unstable, especially in right-hand corners. I think it may also be pulling to the left, but that could just be my poor balance.

I've tried fiddling with the wheel alignment, but other than that I don't know what else it can be.

So, any suggestions?
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Alpha-9
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PostPosted: 17:32 - 18 Jan 2014    Post subject: Reply with quote

check rear wheel alignment
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Clutchy
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PostPosted: 18:37 - 18 Jan 2014    Post subject: Reply with quote

Is the rear wheel buckled?
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TheCatSatOnTh...
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PostPosted: 19:38 - 18 Jan 2014    Post subject: Reply with quote

Have you tried checking your tyre pressures too.
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stinkwheel
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PostPosted: 02:41 - 19 Jan 2014    Post subject: Reply with quote

I'd be checking the alignment and also checking the tyre bead is sitting fully on the rim all the way round.

Front wheel didn't go in? Because the forks can twist in the yokes after a hard bash too.
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poleposition
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PostPosted: 12:45 - 19 Jan 2014    Post subject: Reply with quote

If it feels unstable after hitting a pothole then you've clearly done damage somewhere...dont ride it...get it checked properly if your not sure what your looking for.
my guess is either the wheel is badly buckled..or its been forced to one side in the swinging arm..possibly both. if its been forced to one side then clearly it wasnt tight enough..but that alone would just cause the bike to crab..obviously the chain would be misaligned too..
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daffy
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PostPosted: 13:15 - 19 Jan 2014    Post subject: Reply with quote

get it on a paddock stand and give the wheel a spin.
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Islander
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PostPosted: 13:41 - 19 Jan 2014    Post subject: Reply with quote

Simple stuff first, check the tyre pressures. Wheel alignment is straightforward. Measure the distance between the centre of the swingarm pivot and the centre of the rear wheel spindle on each side of the bike and make sure they're exactly the same, Check that, then check the front end to make sure the forks haven't twisted in the clamps.
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DickVanWinkle
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PostPosted: 13:58 - 19 Jan 2014    Post subject: Reply with quote

Well, I have tried to align the wheel using the markings on the swingarm, but it still didn't feel right.

But I've just used the String Method, and it turns out the markings are at least a half off - that probably didn't help.

Anyway, just taken it for a quick spin, and all feels fine again.


Also, I think the bead is seated fully, and the pressures were correct.

Clutchy wrote:
Is the rear wheel buckled?

I don't think so, but I don't suppose there's a way I can check that by myself, is there?

Islander wrote:
check the front end to make sure the forks haven't twisted in the clamps.

Checked that yesterday - slackened off all the relevant bolts and re-tightened again.


Anyway, thanks for all your help
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Eddie Hitler
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PostPosted: 18:21 - 19 Jan 2014    Post subject: Reply with quote

DickVanWinkle wrote:

I don't think so, but I don't suppose there's a way I can check that by myself, is there?


Yeh, you can spin it. Laughing .
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DickVanWinkle
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PostPosted: 21:24 - 19 Jan 2014    Post subject: Reply with quote

Eddie Hitler wrote:
Yeh, you can spin it. Laughing .

Funnily enough I had that idea myself Laughing . I was just wondering if there was a more accurate way of telling if it was buckled - seems to be fine though.


Anyway, went for a longer ride earlier and it's much better after a 'proper' alignment.
Thanks for all the help, Gents.
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kramdra
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PostPosted: 22:27 - 19 Jan 2014    Post subject: Reply with quote

Im not sure what kind of abuse it takes to kill wheel bearings. I would expect them to be damaged before alignment became a problem?
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Alpha-9
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PostPosted: 11:41 - 20 Jan 2014    Post subject: Reply with quote

kramdra wrote:
Im not sure what kind of abuse it takes to kill wheel bearings. I would expect them to be damaged before alignment became a problem?

Where d'you get that logic? Easier to knock something out of alignment than deform metal parts, i'd imagine

He already said alignment solved it anyway, i'm a weeeenerrr!
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dydey90
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PostPosted: 12:07 - 20 Jan 2014    Post subject: Reply with quote

DickVanWinkle wrote:
I was just wondering if there was a more accurate way of telling if it was buckled


Stick a clock on it?
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Islander
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PostPosted: 12:27 - 20 Jan 2014    Post subject: Reply with quote

dydey90 wrote:
DickVanWinkle wrote:
I was just wondering if there was a more accurate way of telling if it was buckled


Stick a clock on it?


Easier still use a stick of chalk held firm against the swingarm and not quite touching the rim, then spin and see if it marks the rim anywhere or if the gap obviously increases. Smile
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dydey90
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PostPosted: 12:31 - 20 Jan 2014    Post subject: Reply with quote

Islander wrote:
Easier still use a stick of chalk held firm against the swingarm and not quite touching the rim, then spin and see if it marks the rim anywhere or if the gap obviously increases. Smile


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Islander
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PostPosted: 12:34 - 20 Jan 2014    Post subject: Reply with quote

A lot cheaper than buying a dial test indicator (if you don't already have one) that you're unlikely to use that often and quite effective. Razz
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iooi
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PostPosted: 13:12 - 20 Jan 2014    Post subject: Reply with quote

Alpha-9 wrote:

He already said alignment solved it anyway, i'm a weeeenerrr!


So it was all right before the crunch.

So we take it that OP was using markings on swinging arm before and matching up.
With no handing problems.

Since crunch it is now 1/2 a mark out....

That would say to me that swinging arm may have a issue of being broken/cracked or pulled out of alignment (bearings)

So this needs further investigation. Before something snaps.....
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Alpha-9
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PostPosted: 21:35 - 20 Jan 2014    Post subject: Reply with quote

iooi wrote:
Alpha-9 wrote:

He already said alignment solved it anyway, i'm a weeeenerrr!


So it was all right before the crunch.

So we take it that OP was using markings on swinging arm before and matching up.
With no handing problems.

Since crunch it is now 1/2 a mark out....

That would say to me that swinging arm may have a issue of being broken/cracked or pulled out of alignment (bearings)

So this needs further investigation. Before something snaps.....

Insightful Thumbs Up Karma

Seems weird anyway, having off centre alignment has never caused me any serious instability on my shitty 125s at least
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