KZ900 valve shims Machining

  • Kaw-boy 900
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Re: KZ900 valve shims Machining

22 Mar 2025 06:48
#910345
TexasKZ wrote:
Running without a shim could leave those marks as well as damage the cam lobe.

No doubt...You're right, the shims were most likely dislodged from the bockets and the cam lobe has made those marks.
The head had to be replaced because no damage noticed . The cams look good...probably replaced too !
 
Kawasaki:
S1 250 triple 1973
H1, 500 triple 1975
LTD 1000, 1982
Ninja 1000R 1987
Ninja ZX12R 2006
KZ900 1976.
Yamaha RD 350 1973
Ducati 1098 2007
Harley Softail 2009 For sale !

Mechanic at:
Daytona Motor Montreal.
Kawasaki Center.
Pont Viau Motorcycle.
Chabot Marine & Sport.
Honbec Mtl.

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Re: KZ900 valve shims Machining

22 Mar 2025 07:15 - 22 Mar 2025 07:20
#910348
zed1015 wrote:
TexasKZ wrote:
Running without a shim could leave those marks as well as damage the cam lobe.
+1 on that.
That bucket has been run without a shim.
Most likely a ground shim shattered and was spat out.
I would advise replacing any buckets with that damage.
The indent /trough on the bucket caused by the cam will leave a void under the replacment shim which could also cause that one to fracture as well.

Thanks for the head ups ! I verified  with my gauge and it is find and the shim move freely but I will order a new one anyway. Note: I have replaced the one with the tacks weld inside.





 
Kawasaki:
S1 250 triple 1973
H1, 500 triple 1975
LTD 1000, 1982
Ninja 1000R 1987
Ninja ZX12R 2006
KZ900 1976.
Yamaha RD 350 1973
Ducati 1098 2007
Harley Softail 2009 For sale !

Mechanic at:
Daytona Motor Montreal.
Kawasaki Center.
Pont Viau Motorcycle.
Chabot Marine & Sport.
Honbec Mtl.
Last edit: 22 Mar 2025 07:20 by Kaw-boy 900.

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  • zed1015
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Re: KZ900 valve shims Machining

22 Mar 2025 07:28
#910349
Rolf1976_KZ900 wrote:
regarding shim buckets on the z900  i heard somehwere that on some z900 the buckets came with a void from factory that made shims crack.They was later replaced. Do you know anything about that ? and is it anyway to identify the buckets that is good ?
Yes! 
The early Z1 buckets had a small dimple in the center which caused the shims to crack and were subject of a service bulletin so they should have all gone in the dealers bin years ago..
Their replacements and subsequent buckets on all post Z1 engines just have a smooth plain surface with no indent and cause no problems.

 
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  • Cra-z1
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Re: KZ900 valve shims Machining

22 Mar 2025 09:44 - 22 Mar 2025 09:46
#910360
When I picked up my oct 72 Z1 9 (WITH 12,000 MILES) I was surprised to find it had the original buckets which I changed out with an engine rebuild.
Last edit: 22 Mar 2025 09:46 by Cra-z1.
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  • Scirocco
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Re: KZ900 valve shims Machining

22 Mar 2025 14:01
#910366
Kaw-boy 900 wrote:
The head and valves are back from the machine shop, Sterms, springs retainers and keepers trimmed.  Valves shims are 2.70 - 2.80 Ex and 2.55 - 260 mm. (2 of each from Zi Entreprises set) I'm happy with the results. Now waiting for new valve seals.

It look like the previous owner or his mechanic had issue with thin shim !  There is 2 bucket like this. What else can make this kind of marks ?     
The imprint on the bucket looks like some wanna be genius mechnic add a cut out thin sheet metal of a beer can to adjust the valve lash. 
[img
[img
[img
My 1975 Z 1 B 900 Project

www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode
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Re: KZ900 valve shims Machining

22 Mar 2025 14:17 - 22 Mar 2025 14:40
#910368
Scirocco wrote:
The imprint on the bucket looks like some wanna be genius mechnic add a cut out thin sheet metal of a beer can to adjust the valve lash. 
[img
[img
[img


Let me measure it...wont surprised me at this point...LOL. 
The sharp gauges around the external perimeter make me belived that was caused byt a FU*King machined shim cracked and /or spilled out of his nest ! I can imagine the rest of the story,...wrong valves keeper got out, valve hit the piston then kick out the bucket shim and a ''NOT' funny noised happened ! Look that it happened at start up....my 2 cents !






 
Kawasaki:
S1 250 triple 1973
H1, 500 triple 1975
LTD 1000, 1982
Ninja 1000R 1987
Ninja ZX12R 2006
KZ900 1976.
Yamaha RD 350 1973
Ducati 1098 2007
Harley Softail 2009 For sale !

Mechanic at:
Daytona Motor Montreal.
Kawasaki Center.
Pont Viau Motorcycle.
Chabot Marine & Sport.
Honbec Mtl.
Last edit: 22 Mar 2025 14:40 by Kaw-boy 900.

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Re: KZ900 valve shims Machining

22 Mar 2025 15:46
#910376
Kaw-boy 900 wrote:
The sharp gauges around the external perimeter make me belived that was caused byt a FU*King machined shim cracked and /or spilled out of his nest !





The gouges around the perimeter of the bucket were caused by the edges of the cam lobe once the shim had gone and without the shim the cam lobe also wears a groove on the bucket surface.
If you measure the width of the imprint you will find it matches the width of the cam lobe..
AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
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Re: KZ900 valve shims Machining

22 Mar 2025 16:16 - 22 Mar 2025 16:23
#910383
zed1015 wrote:
Kaw-boy 900 wrote:
The sharp gauges around the external perimeter make me belived that was caused byt a FU*King machined shim cracked and /or spilled out of his nest !

Hey Zed :) I understand, a picture is worth a thousand words !

The whole surface are smooth, What do you think about it
 :(




 


 
Kawasaki:
S1 250 triple 1973
H1, 500 triple 1975
LTD 1000, 1982
Ninja 1000R 1987
Ninja ZX12R 2006
KZ900 1976.
Yamaha RD 350 1973
Ducati 1098 2007
Harley Softail 2009 For sale !

Mechanic at:
Daytona Motor Montreal.
Kawasaki Center.
Pont Viau Motorcycle.
Chabot Marine & Sport.
Honbec Mtl.
Last edit: 22 Mar 2025 16:23 by Kaw-boy 900.
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Re: KZ900 valve shims Machining

22 Mar 2025 16:55
#910384
There is no more sickening sound than "mechanical love making :):)
1982 KZ1000 Ltd
www.kzrider.com/forum/11-projects/617631...-82-begins?start=192
kzrider.com/filebase-alias?view=download...d-fault-diagnosis&ca
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Re: KZ900 valve shims Machining

22 Mar 2025 20:31
#910389
Whatever shop worked on that engine should be shut down
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Re: KZ900 valve shims Machining

23 Mar 2025 03:26
#910396
Kaw-boy 900 wrote:
zed1015 wrote:
Kaw-boy 900 wrote:
The sharp gauges around the external perimeter make me belived that was caused byt a FU*King machined shim cracked and /or spilled out of his nest !

Hey Zed :) I understand, a picture is worth a thousand words !

The whole surface are smooth, What do you think about it
 :(




 



 
No problem using that cam.
I'd just dress back the chipped edges to remove the sharp edges and any loose chips and it's good to go.
 
AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
www.kzrider.com/23-for-sale/611992-air-c...lide-mikunis?start=0





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  • TexasKZ
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Re: KZ900 valve shims Machining

23 Mar 2025 06:14
#910399
I wonder how many cam chips and loose pieces of shattered shims are still floating around inside that engine?
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

www.kzrider.com/11-projects/620336-anoth...uild-thread?start=24
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