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ZX6R G2 1999 steering problem, anyone help??

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tpuck
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Joined: 07 Jun 2009
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PostPosted: 12:58 - 07 Jun 2009    Post subject: ZX6R G2 1999 steering problem, anyone help?? Reply with quote

Hi all,
I took a shot of my mates zx6r a couple of days ago, very scary!!
The bike feels very strange and corners really badly, as i tryed to work out what was going on i noticed that the steering seems very reluctant to steer then all of a sudden the bike would fall very quickly to the side of lean!! does that make sense??

i spent a wee while trying to counter steer both directions and it was the same every time, the result is massive over steer and a very uneasy feeling on the bike.

My mate has not long passed his test and has been saying that he cant get any confidence in cornering, i now know why.

i have checked the steering head bearing and there seems to be no play in it, could it still be the problem??

can anyone help? thank you
T
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TUBZ69
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PostPosted: 13:05 - 07 Jun 2009    Post subject: Reply with quote

it honnestly sounds like fucked headbearings mate, or the tyres could be squared off...
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TUBZ69
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PostPosted: 13:07 - 07 Jun 2009    Post subject: Reply with quote

it honnestly sounds like fucked headbearings mate, or the tyres could be squared off...
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ms51ves3
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PostPosted: 13:17 - 07 Jun 2009    Post subject: Reply with quote

Definitely check the tyres for squaring Thumbs Up
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KevTM
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PostPosted: 13:43 - 07 Jun 2009    Post subject: Reply with quote

squared tyres was the first thing i thought of..

if it feels like sh*t though it could be anything, low fork oil, wrong fork oil, buggered rear shock, wrong shock settings, dodgy bushes in the linkages, wrong tyre pressures even, misaligned rear tyre adjustment, front/rear height set up wrong.

Worth giving the whole thing a once over as it could be a combination of some/all of above. Wink


I take no responsibility for any damages that may be caused from the advice given.
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Chriss
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PostPosted: 13:52 - 07 Jun 2009    Post subject: Reply with quote

Had this on my Triumph, the tyres were over inflated to around 50psi.
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The Tot
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PostPosted: 13:55 - 07 Jun 2009    Post subject: Reply with quote

Won't be surprising on an F/G 6R for the headbearings to go. Lean the bike on its side stand to get the front wheel off the ground and turn the bars from lock to lock - if it's notchy, then head bearings are shot - easy job to do. That's what happened to my 6R AFTER it was diagnosed that the tyres weren't square (only had them on for 1000 miles). But then again, there's no play.

If you can find the suspension settings from a haynes manual - put it back to stock. That'll be a cheap fix with a spanner.

If you want new boots, I can vouch for getting roadsmarts on the bike!
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tofu-wtf
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PostPosted: 09:08 - 08 Jun 2009    Post subject: Reply with quote

I have a G1 and I can tell you that the tyres dont have to be too squared off to get that effect.

I have just changed the tyres on mine and I was amazed at the amount of handling that had been lost.

IMO If the head bearings are OK, and that is like a 2 minute check, go get new tyres.
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Fawbish
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PostPosted: 09:23 - 08 Jun 2009    Post subject: Reply with quote

Titz wrote:
Won't be surprising on an F/G 6R for the headbearings to go. Lean the bike on its side stand to get the front wheel off the ground and turn the bars from lock to lock - if it's notchy, then head bearings are shot - easy job to do. That's what happened to my 6R AFTER it was diagnosed that the tyres weren't square (only had them on for 1000 miles). But then again, there's no play.

If you can find the suspension settings from a haynes manual - put it back to stock. That'll be a cheap fix with a spanner.

If you want new boots, I can vouch for getting roadsmarts on the bike!



Me and Titz are the resident F/G gurus.


I am almost 100% certain it's headbearings. Does it feel notchy at slow speeds?
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Last edited by Fawbish on 09:33 - 08 Jun 2009; edited 1 time in total
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Fawbish
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PostPosted: 09:29 - 08 Jun 2009    Post subject: Reply with quote

tofu-wtf wrote:
I have a G1 and I can tell you that the tyres dont have to be too squared off to get that effect.

I have just changed the tyres on mine and I was amazed at the amount of handling that had been lost.

IMO If the head bearings are OK, and that is like a 2 minute check, go get new tyres.


I've honestly found that even if a fair amount of swuaring has occured, its usually nowhere near as noticeable as headbearings. And a bike will still corner fine with squared off tyres if pressures are somewhere around correct, if the person is cornering properly.

Good pressure + Squared tyres = Very minimal effect

Bad pressure +Squared tyres = noticeable effect to the point of instability

Good or bad pressure + shit headbearings (notchy/fucked) = very noticeable shit handling Laughing
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The Tot
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PostPosted: 09:32 - 08 Jun 2009    Post subject: Reply with quote

What mileage is the bike? If its anywhere between 20-35k, and there's no history or receipts to check that it's done, then it'll probably be wise to change or do the following:

Arrow Grease rear shock joints and linkages
Arrow Change tyres
Arrow change head bearings
Arrow Re-gas and service rear shock
Arrow Change front fork oil


Once that's all done, it'll be as sweet as a nut. I noticed my bike go through the transition of being a stable, compliant turner to what you've just described there and the steps . The mitigating steps were taken in that order as the problem progressively got worse.
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TheDonUK
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PostPosted: 11:18 - 08 Jun 2009    Post subject: Reply with quote

Also check the front wheel bearings, worn ones can cause similar handling as to that which you describe...

Low tyre pressures will make it sloppy, but that double tip into corners is often bearings i have found.

What tyres are you running on it?
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Fawbish
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PostPosted: 12:00 - 08 Jun 2009    Post subject: Reply with quote

Titz wrote:
What mileage is the bike? If its anywhere between 20-35k, and there's no history or receipts to check that it's done, then it'll probably be wise to change or do the following:

Arrow Grease rear shock joints and linkages
Arrow Change tyres
Arrow change head bearings
Arrow Re-gas and service rear shock Arrow Change front fork oil
Once that's all done, it'll be as sweet as a nut. I noticed my bike go through the transition of being a stable, compliant turner to what you've just described there and the steps . The mitigating steps were taken in that order as the problem progressively got worse.



Obvs still advised, but not essential I'd say. Unless theres genuinely a problem with it, mine has never been serviced, seen some harsh track use, and is still going strong at 27K.

Obvs, something that will need doing as time goes on like.

Same with the forkoil, as far as I know, never been changed Laughing Though will be doing it soon, as I have a weeping forkseal so will do the lot.

Oh, and I totally agree with rear linkages. Upto 22/23K, my bike hadnt really seen any "abuse" and there was a lot of play in the linkages. So much so that it failed an MOT. Def worth doing, got my full set of bearings for about 80 quid I think, a fair amount of hassle if doing it on the deck, what with full exhaust off etc Laughing
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