ZZR1200 C1 Head Bearings???

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ZX-9RE1Nick
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ZZR1200 C1 Head Bearings???

Post by ZX-9RE1Nick » Thu Jul 31, 2014 9:13 pm

My GF has an '02 ZZR1200 in vgc, showing just shy of 20k miles.
I gave it a basic service recently, checked tyres & pressures, fluids & topped up where necessary, adjusted chain tension & fitted braided brake lines F&R & bled the systems
However, on a road test afterwards, I was horrified to see the headstock shaking frantically upon letting go of the bars. Approx 50mph on a dry even road surface.
Pulled over, checked for any obvious signs of the cause, but all looked in order.
Tried it again a few miles later, same result. If I hadn't grabbed the bars again, it feels it would go into full on tank slapper mode & spit me off!
Could it be the headstock bearings? If so, are they a D.I.Y. job to replace or take it to a mechanic?
PREVIOUS RIDES:
'76 FS1E (78 mph!)
'81 Fantic Caballero 125
'83 DT125LC
'89 GSX 550ES
'95 Fireblade RRS (Sorry, I soon realised the error of my ways!)
'96 ZX-9R B3
'99 R6
'04 ZX-636R B1
CURRENT RIDE:
'00 ZX-9R E1
Gotta love a mean green ninja machine - even if it's blue!

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red_zx9r
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Post by red_zx9r » Thu Jul 31, 2014 9:35 pm

have you had it on the centre stand and give the forks a tug to check for play
sorry but i can`t go to hell satan still has the restraining order on me

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Steve-TC1
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Post by Steve-TC1 » Thu Jul 31, 2014 9:50 pm

Are you sure you got your tyre pressure right and your chain alignment :?:

put the bike on it's centre stand , stand in front of the bike and grab both fork bottoms and push and pull them , if you can feel a clunk and play from the head bearing area you need to adjust the bearings

To adjust

Undo the centre nut on the top yoke , undo the bottom yoke nuts on both sides , tap the bottom adjuster ring round {clockwise} a few mm , set the front wheel in the straight ahead position and tap the tyre, the bars and wheel should fall to full lock , keep taping the bottom adjuster round by a few mm and test until the wheel shows signs of needing more force to get it to tap to full lock , tap the bottom adjuster backwards by 1mm then tighten the top adjuster nut , now tighten you're bottom yoke nuts then the top yoke centre nut .

check your wheel spindle tightness why on the stand

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ZX-9RE1Nick
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Post by ZX-9RE1Nick » Thu Jul 31, 2014 11:37 pm

I'm up there in the week after Thruxton BSB this weekend, I will follow Steve's advice & report back.
Thanks guys, appreciated =D> =D> =D>
PREVIOUS RIDES:
'76 FS1E (78 mph!)
'81 Fantic Caballero 125
'83 DT125LC
'89 GSX 550ES
'95 Fireblade RRS (Sorry, I soon realised the error of my ways!)
'96 ZX-9R B3
'99 R6
'04 ZX-636R B1
CURRENT RIDE:
'00 ZX-9R E1
Gotta love a mean green ninja machine - even if it's blue!

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ZX-9RE1Nick
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Post by ZX-9RE1Nick » Fri Aug 08, 2014 11:15 am

Right then...........
I finally found the time to take a look at Sue's ZZR1200, got it on the centre stand and I can feel no play whatsoever in the bearings/headstock area. If I tap the front wheel firmly, it takes quite a lot of force to get it to swing to full lock and stay there, but wants to return to the straight ahead position by gravity if that makes sense?
One more thing, since discovering the problem; Sue has 'suddenly remembered' that her ex BF lowered the bike front and rear by 2" - as she is a short arse.
I have no idea what/how he did this, but it was several years ago and it's been through 5 MOT's since then.
The only info I have is that he applied 12mm lowering on the dog legs I'm being told, which lowers it 2"
..... WTF that means I have no idea :!:

:Hlp :Hlp :Hlp
PREVIOUS RIDES:
'76 FS1E (78 mph!)
'81 Fantic Caballero 125
'83 DT125LC
'89 GSX 550ES
'95 Fireblade RRS (Sorry, I soon realised the error of my ways!)
'96 ZX-9R B3
'99 R6
'04 ZX-636R B1
CURRENT RIDE:
'00 ZX-9R E1
Gotta love a mean green ninja machine - even if it's blue!

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yorkie
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Post by yorkie » Fri Aug 08, 2014 11:37 am

Lowering the front and rear together should not be a problem, except for reduced ground clearance.

When you turned the handle bars from side to side did you notice a slight ding at the centre point that takes a little push of the bars to move out of, if so the head bearings are worn. You might not have to change them for this but just drop the forks and clean, spin and regrease the bearings. I dout thought that this is the problem of the head shake, does the wheel spin ok when off the ground, rest your index fingers on the wheel mounts while the wheel is spinning and feel for roughness. If you feel more than just a tiny little bit then the wheel bearings will need chaging. Check for the brakes dragging.
Just got yourself a ZX-9R, then do yourself and your bike a favour, read this thread the sticky post in General Technical viewtopic.php?f=21&t=28097

Please will forum members put their bike model letter, & 1 or 2 after their Profile Location. eg: Your Town & B1,2,3,4 C1,2 E1,2 F1,2
As all zx9's are all slightly different, and I get fed up having to ask which model & number, as a year may not be accurate.
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Post by ZX-9RE1Nick » Fri Aug 08, 2014 3:53 pm

Tried all of the suggestions, and still can't feel any tightness or slack anywhere. The only thing that is slightly 'indifferent' is that the bars are a little tighter to turn to the left due to cables rubbing over headlight bracket and frame.
Other than that, I'm stumped and it'll be put down to 'one of those things'; and I'll advise Sue not to let go of the bars. Next time it goes into a workshop for anything, I'll get them to investigate it a bit further.
Cheers for all the input and suggestions guys ;)
PREVIOUS RIDES:
'76 FS1E (78 mph!)
'81 Fantic Caballero 125
'83 DT125LC
'89 GSX 550ES
'95 Fireblade RRS (Sorry, I soon realised the error of my ways!)
'96 ZX-9R B3
'99 R6
'04 ZX-636R B1
CURRENT RIDE:
'00 ZX-9R E1
Gotta love a mean green ninja machine - even if it's blue!

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yorkie
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Joined: Mon Sep 25, 2006 5:46 pm
Location: Altofts Yorks. Blue 9C2 9F2 & 12B4

Post by yorkie » Fri Aug 08, 2014 4:47 pm

It could be a bad tyre or a lost wheel weight maybe.
Just got yourself a ZX-9R, then do yourself and your bike a favour, read this thread the sticky post in General Technical viewtopic.php?f=21&t=28097

Please will forum members put their bike model letter, & 1 or 2 after their Profile Location. eg: Your Town & B1,2,3,4 C1,2 E1,2 F1,2
As all zx9's are all slightly different, and I get fed up having to ask which model & number, as a year may not be accurate.
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Writhing freak1
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Post by Writhing freak1 » Fri Aug 08, 2014 6:51 pm

I have a ZZR1200 and a mate also has one. Both of ours does that. The way to cure it is to always have both hands on the bars.
Zx9rc2, ZRX1200r, ZZr1200, Zx9re1, Zx12r, Zx9re1, ZZr1400, Zx12r, Fireblade, ZRX12, ZZR1100, Fzr1000, GPZ900, CB900f, CB750, CB400n, CS5E, crm250, xr400, crm250, xr400, KLX300, CD175, Beta rev3, pcx125, GP100, YL1, Fizzie, Fantic. In no particular order and I'm sure I've forgotten some.

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Steve-TC1
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Post by Steve-TC1 » Sat Aug 09, 2014 10:18 am

Writhing freak1 wrote:I have a ZZR1200 and a mate also has one. Both of ours does that. The way to cure it is to always have both hands on the bars.
That's bad chassis design if they all do it :shock:

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ZX-9RE1Nick
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Post by ZX-9RE1Nick » Sat Aug 09, 2014 10:49 am

yorkie wrote:It could be a bad tyre or a lost wheel weight maybe.
Oddly enough Yorkie, I decided to polish the rims on it after giving up on the head shaking investigation causes. I ended up shaking my own head! :roll:
Anyways, I discovered what looked like a missing wheel balance weight on the front rim, maybe an old one removed from when this tyre was fitted (Sue doesn't clean her bike - like EVER!). However the tyre has worn evenly, & is shortly due for replacement. So a newly fitted & balanced tyre will eliminate that as the cause, I'll report back once the new tyre goes on.
PREVIOUS RIDES:
'76 FS1E (78 mph!)
'81 Fantic Caballero 125
'83 DT125LC
'89 GSX 550ES
'95 Fireblade RRS (Sorry, I soon realised the error of my ways!)
'96 ZX-9R B3
'99 R6
'04 ZX-636R B1
CURRENT RIDE:
'00 ZX-9R E1
Gotta love a mean green ninja machine - even if it's blue!

User avatar
ZX-9RE1Nick
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Posts: 172
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Post by ZX-9RE1Nick » Sat Aug 09, 2014 10:55 am

Steve-TC1 wrote:
Writhing freak1 wrote:I have a ZZR1200 and a mate also has one. Both of ours does that. The way to cure it is to always have both hands on the bars.
That's bad chassis design if they all do it :shock:
Really???
I find that strange, as they're a heavy bike & in the past I've owned a Fireblade, R6 & 636R B1 which are notoriously 'twitchy' on the front end; yet none of these bikes (or either of my 9R's) have ever shook their heads.....
Would have to agree with Steve & say if it's a common fault then Kawasaki have messed up.
PREVIOUS RIDES:
'76 FS1E (78 mph!)
'81 Fantic Caballero 125
'83 DT125LC
'89 GSX 550ES
'95 Fireblade RRS (Sorry, I soon realised the error of my ways!)
'96 ZX-9R B3
'99 R6
'04 ZX-636R B1
CURRENT RIDE:
'00 ZX-9R E1
Gotta love a mean green ninja machine - even if it's blue!

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