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Bike wont lean to the right!?

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joezxr
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Joined: 06 Jan 2013
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PostPosted: 17:38 - 03 Aug 2015    Post subject: Bike wont lean to the right!? Reply with quote
I have a 2003 zx6r ( b1h) and when i lean to the right it becomes very unstable, the front end gets a slow wobble and it feels like if i lean any further im going to drop off the face of the earth Embarassed the weird thing is it leans to the left absolutely fine!

Iv changed my headstock bearings, had my forks oil and seals replaced, changed my front wheel bearings, torqued everything up, set my suspension up evenly, checked my swingarm and rear wheel bearings for freeplay, and made sure my wheel alignment is straight and its all normal...

my last idea is it may be my tyres, but they dont seem to show any uneven wear.

Does anybody know what this could be?

cheers
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MCN
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Joined: 22 Jul 2015
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PostPosted: 17:48 - 03 Aug 2015    Post subject: Reply with quote
Simple:

Pressing the brake/break lever as you lean over.
Bent twisted front fork.
Helluva Camber on the road where you are.

Complex:

Twisted Frame Swing Arm which changes geometry when cornering and under compression.

Something more simple or sinister. Crying or Very sad
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mentalboy
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Joined: 05 May 2012
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PostPosted: 17:49 - 03 Aug 2015    Post subject: Reply with quote
Any idea if it's had a prang in the past?

Have you checked that the fork stanchions are not bent and that there's no sign of damage at the headstock (paint crinkling/cracking can be a good indicator)?
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TheManWithThe...
Brolly Dolly



Joined: 30 Aug 2010
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PostPosted: 20:20 - 03 Aug 2015    Post subject: Reply with quote
...tyre pressures?
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MarJay
But it's British!



Joined: 15 Sep 2003
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PostPosted: 21:14 - 03 Aug 2015    Post subject: Reply with quote
tyre worn on one side and not on another?

Are you sure the wheels are inline? Swinging arm adjustment marks are notoriously inaccurate. Have you used the long piece of string method?
____________________
British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F; Cheap project: CBR900RR FireBlade
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.
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MCN
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Joined: 22 Jul 2015
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PostPosted: 23:50 - 03 Aug 2015    Post subject: Reply with quote
MarJay wrote:
tyre worn on one side and not on another?

Are you sure the wheels are inline? Swinging arm adjustment marks are notoriously inaccurate. Have you used the long piece of string method?


It's screaming alignment (or soft tyre/s) but the man says they're good. ???
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MarJay
But it's British!



Joined: 15 Sep 2003
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PostPosted: 00:19 - 04 Aug 2015    Post subject: Reply with quote
MCN wrote:
MarJay wrote:
tyre worn on one side and not on another?

Are you sure the wheels are inline? Swinging arm adjustment marks are notoriously inaccurate. Have you used the long piece of string method?


It's screaming alignment (or soft tyre/s) but the man says they're good. ???


He says they are good but he might be going by the swinging arm adjustment marks.
____________________
British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F; Cheap project: CBR900RR FireBlade
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.
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joezxr
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Joined: 06 Jan 2013
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PostPosted: 11:06 - 04 Aug 2015    Post subject: Reply with quote
mentalboy wrote:
Any idea if it's had a prang in the past?

Have you checked that the fork stanchions are not bent and that there's no sign of damage at the headstock (paint crinkling/cracking can be a good indicator)?


It doesnt look as if its been crashed or anything, and the forks seems dead straight when i took them out to change the oil and seals!
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joezxr
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Joined: 06 Jan 2013
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PostPosted: 11:07 - 04 Aug 2015    Post subject: Reply with quote
MarJay wrote:
tyre worn on one side and not on another?

Are you sure the wheels are inline? Swinging arm adjustment marks are notoriously inaccurate. Have you used the long piece of string method?


from what i can see and feels the tyres look fine but i am running these horrible continental things it came with so my last idea is to swap the tyres!

Iv measured from the centre of the swingarms axle to the centre of the rear wheel axle both sides and the measurements are both bang on Confused is there a better way to check?
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brains_t
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Joined: 20 Jun 2013
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PostPosted: 11:11 - 04 Aug 2015    Post subject: Reply with quote
Have you checked the manufacture date of tyres, they may be too old
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 11:15 - 04 Aug 2015    Post subject: Reply with quote
mentalboy wrote:
Any idea if it's had a prang in the past?

Have you checked that the fork stanchions are not bent and that there's no sign of damage at the headstock (paint crinkling/cracking can be a good indicator)?


Or even not a prang.

A mate of mine has cracked two ZX9r frames without crashing them.
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I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.
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MCN
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Joined: 22 Jul 2015
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PostPosted: 11:51 - 04 Aug 2015    Post subject: Reply with quote
joezxr wrote:
MarJay wrote:
tyre worn on one side and not on another?

Are you sure the wheels are inline? Swinging arm adjustment marks are notoriously inaccurate. Have you used the long piece of string method?


from what i can see and feels the tyres look fine but i am running these horrible continental things it came with so my last idea is to swap the tyres!

Iv measured from the centre of the swingarms axle to the centre of the rear wheel axle both sides and the measurements are both bang on Confused is there a better way to check?


Bike should be on a stand of some sort.
You can make a Ghetto paddock stand using two car axle stands under the footrests to hold the bike up. It is possible to do this yourself but if not confident ask your mum or your nan to help. Smile

You take a long string. Easier with two pieces on either side at the same time.
Tie it to a spoke on the rear wheel about 6" off the ground.
Wrap it around the back of the tread to the opposite side of the bike.
Pull the string towards the front wheel.
Hold the string out away from the front wheel.
Slowly pull the string tight as you move the end in towards the front wheel.
Watch the string at the 'front' of the rear wheel.
As it touches the front of the rear wheel stop.
You now have effectively got a 'laser' line down the side of the bike.
Now measure the gap between the inside of the string and the font and rear point on the front wheel.
You need to measure both to allow for steering turned slightly L or R.
Do the same for the other side if you haven't used two strings (lasers).
If the gap between the string/s and wheels are the same for both side then the rear wheel and frame are 'aligned'.
If there is a larger gap for one side (having accounted for the steering bit) then you need to adjust the rear wheel position accordingly.
When you have the alignment corrected don't forget to adjust the chain tension again.
DO not fcuk up your alignment.
Adjust the chain by turning the adjusting bolts equally.
One flat has a big effect on alignment so try to do it one flat at a time. Left then right then left then right etc.
Chain adjusted.
Recheck alignment again (for LOLs).
Tighten the rear axle nut.
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joezxr
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Joined: 06 Jan 2013
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PostPosted: 20:45 - 04 Aug 2015    Post subject: Reply with quote
brains_t wrote:
Have you checked the manufacture date of tyres, they may be too old


yes tyres are 2012, all seem okay on inspection, rubber still feels like rubber haha
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joezxr
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Joined: 06 Jan 2013
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PostPosted: 20:47 - 06 Aug 2015    Post subject: SOLVED Reply with quote
found out the problem, the forks/front wheel needed to be aligned (yes that exists)

From parking on the path at work and going up the curbs it with my handlebars turned it had made my wheel slightly lean to one side!

I loosened off everything below the top yoke bolts and gave the forks a good push down a few times, retighten it all up and the wheel is now straight!

happy days!
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MCN
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Joined: 22 Jul 2015
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PostPosted: 21:14 - 06 Aug 2015    Post subject: Re: SOLVED Reply with quote
joezxr wrote:
found out the problem, the forks/front wheel needed to be aligned (yes that exists)

From parking on the path at work and going up the curbs it with my handlebars turned it had made my wheel slightly lean to one side!

I loosened off everything below the top yoke bolts and gave the forks a good push down a few times, retighten it all up and the wheel is now straight!

happy days!


You owe the forum about Twenty two Potatoes Fifty for misleadingage of the technical dept.

Some of us spent an entirety stripping down the back end for you and it was all in the front bit. Rolling Eyes

Well you have saved yourself on tyres.
May have cost you four pairs of tyres before the forks were noticed. Smile
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Sload
World Chat Champion



Joined: 28 Aug 2011
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PostPosted: 21:16 - 06 Aug 2015    Post subject: Reply with quote
I had to google string method as the descriptions sounded a bit Dutch

https://www.yamahafz1oa.com/sportryderswheelalignmentmethod.shtml
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MCN
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Joined: 22 Jul 2015
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PostPosted: 21:33 - 06 Aug 2015    Post subject: Reply with quote
Sload wrote:
I had to google string method as the descriptions sounded a bit Dutch

https://www.yamahafz1oa.com/sportryderswheelalignmentmethod.shtml


It's an auld trick for checking truck chassis alignment. Wink

For that you drop plumb bobs from matching parts of the chassis at various point.
Chalk mark the point they touch on the floor.
Measure the distance between the marks on diagonals.
Compare the measurements.
If the chassis is true both should be the same.

I find the string-bike thing is easier than the plank of wood method as the string is straight but the wood can be warped. (Not that Warped).
If you only use the wood you must allow for the warpage-ness in your calculations too.

I have a little laser thing for aligning a telescope mirror. I wanted to modificate that to use as a laser alignment tool on the bikes.
It would need a bit of steel work though but more pressing projects on the go so laser alignment on to-do list.
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Old Thread Alert!

The last post was made 11 years, 55 days ago. Instead of replying here, would creating a new thread be more useful?
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