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Suspension instability issue?

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Albigularis
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Joined: 27 Jun 2014
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PostPosted: 16:44 - 31 May 2015    Post subject: Suspension instability issue? Reply with quote

So, the latest bike is a Z1000. I've noticed that cornering over 70, 80 or so, it gets very unstable. I've tried adjusting all of the front suspension (compression and rebound), as well as the rear (rebound only) and I've noticed where it feels best, but regardless of the changes, the speed-related instability remains.

Both tyres are fine in terms of still being round and I've tried pressures from 38F/42R to 34F/36R with no real difference.

I don't think the back wheel can be put on wrongly either, as it uses a strange circular mounting system-

https://hazzmattpdx.com/ninja1k/Wheel_remove_install/2_remove_rear_brake.jpg

To put into words what it feels like - it's as if the back tyre starts hopping when going around a bend quickly, like it's bouncing almost. Any mid corner bumps seem to throw the bike sideways.

So what else can I check? I don't want to have to go out and buy a shock and cartridge kit, as I'd be as well trading it for something else in that case.
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barrkel
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PostPosted: 17:50 - 31 May 2015    Post subject: Reply with quote

A bit of lost traction isn't too bad. Try bucking and wallowing like a dinghy on the ocean, with the whole bike weaving for a few seconds, after you hit a bump while cornering, and you'll know what poor suspension feels like. I'll take too hard over too soft every day of the week.

Consider getting the suspension adjusted by a suspension outfit.
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CaNsA
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PostPosted: 17:55 - 31 May 2015    Post subject: Reply with quote

At high speed in a straight line is it spot on, no wobbles or vibrations?
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Albigularis
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PostPosted: 18:27 - 31 May 2015    Post subject: Reply with quote

CaNsA wrote:
At high speed in a straight line is it spot on, no wobbles or vibrations?


Under hard acceleration at 100+ it feels like it wants to wobble, but when actually maintaining anything even as high as 150, it's fine.
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Aprilia RS125 - Kawasaki ZXR400 - Triumph Street Triple R - Suzuki GSXR1000 L3 - BMW R1200GS - Kawasaki Z1000 - Kawasaki ZX10R C1H - Ducati Multistrada 1200 S Touring - Suzuki Hayabusa
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Old Git Racing
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PostPosted: 18:36 - 31 May 2015    Post subject: Reply with quote

Have you set the sag with you on it? No point messing with settings if you haven't. Take it to someone who knows what they are doing.

OGR
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Albigularis
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PostPosted: 20:28 - 31 May 2015    Post subject: Reply with quote

Old Git Racing wrote:
Have you set the sag with you on it? No point messing with settings if you haven't. Take it to someone who knows what they are doing.

OGR


I set it the old way of putting a cable tie on the stanchion and adjusting until I was coming home with 10mm-ish of free travel. I've tried backing it off and turning it up as well, with no real difference to the instability issue.
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Biking history so far-
Aprilia RS125 - Kawasaki ZXR400 - Triumph Street Triple R - Suzuki GSXR1000 L3 - BMW R1200GS - Kawasaki Z1000 - Kawasaki ZX10R C1H - Ducati Multistrada 1200 S Touring - Suzuki Hayabusa
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Kickstart
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Joined: 04 Feb 2002
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PostPosted: 20:58 - 31 May 2015    Post subject: Reply with quote

Hi

Any play in the linkages? Any play in the rear wheel?

All the best

K
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evoboy
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Joined: 20 Aug 2009
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PostPosted: 21:00 - 31 May 2015    Post subject: Reply with quote

Albigularis wrote:
Old Git Racing wrote:
Have you set the sag with you on it? No point messing with settings if you haven't. Take it to someone who knows what they are doing.

OGR


I set it the old way of putting a cable tie on the stanchion and adjusting until I was coming home with 10mm-ish of free travel. I've tried backing it off and turning it up as well, with no real difference to the instability issue.


That will be affected by the compression settings on the forks. Its also no good for setting the sag on the shock.

Set the sag correctly first, there's a whole host of info online about it.

Then the hydraulics can be adjusted.
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CaNsA
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PostPosted: 21:50 - 31 May 2015    Post subject: Reply with quote

evoboy wrote:
Set the sag correctly first, there's a whole host of info online about it.


7th vid in this most helpful of threads
https://www.bikechatforums.com/viewtopic.php?t=286410
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