Head Crack

  • 4TheKZ1000
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15 Nov 2012 22:24 - 15 Nov 2012 22:44 #558556 by 4TheKZ1000
Head Crack was created by 4TheKZ1000
On my old MarkII cyclinder head....I have a crack between the valve seats on one cyclinder (see pic) is this head scrap or can it be used. I had a well known engine builder tell me its ok to use...whats the forum think.....?

Also....its a complete head....any value or take to scrap yard.

Attachment 027.JPG not found

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Last edit: 15 Nov 2012 22:44 by 4TheKZ1000.

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  • Motor Head
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15 Nov 2012 22:32 #558559 by Motor Head
Replied by Motor Head on topic Head Crack
They can be repaired of course, but the cost compared to a good head, that's the issue.
I'd chose either before running it that way, as the seats can come loose, possibly causing piston and valves to hit. Could be Ugly, if the piston breaks, :sick:
1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
1979 MAZDA RX7 in the works, 13B...

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  • 4TheKZ1000
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15 Nov 2012 22:36 - 15 Nov 2012 22:36 #558561 by 4TheKZ1000
Replied by 4TheKZ1000 on topic Head Crack
Oh by the way....nice plug repair....some hack worked on it.... :sick: :sick: :sick: :angry:
Last edit: 15 Nov 2012 22:36 by 4TheKZ1000.

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15 Nov 2012 23:50 #558580 by gpz1170
Replied by gpz1170 on topic Head Crack
Contact John Pearson quite sure he can help

don
1974 Z1
1976 KZ900
1978 KZ1000
1981 KZ1000
1983 GPZ1100

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  • wireman
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16 Nov 2012 03:13 #558599 by wireman
Replied by wireman on topic Head Crack
Unless its had a lot of money spent on a porting job in the past id say theres nothing special about it ,just hang on to it if you needs parts like fin pieces to weld on to another good head.
Ebay is full of those ugly 79-80 smog motor heads,yeah I prefer the looks of older ones myself! :laugh:
posting from deep under a non-descript barn in an undisclosed location southwest of Omaha.

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  • APE Jay
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16 Nov 2012 05:28 #558603 by APE Jay
Replied by APE Jay on topic Head Crack
Most of the KZ heads that come thru the shop are like that. Unless you are turboing it of running big nitrous load, you won't have a problem with it.

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16 Nov 2012 08:49 - 16 Nov 2012 08:51 #558610 by LarryC
Replied by LarryC on topic Head Crack

APE Jay wrote: Most of the KZ heads that come thru the shop are like that. Unless you are turboing it of running big nitrous load, you won't have a problem with it.


I received photos just the other day from someone asking that question....I gave the same answer.

Generally I see that on old 900 heads and not on the 1000 heads.

I've never seen the cracks cause a problem on any n/a KZ. Those seats are not going to fall out. That's for dam sure...
Larry C.
Last edit: 16 Nov 2012 08:51 by LarryC.
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  • APE Jay
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16 Nov 2012 20:13 #558708 by APE Jay
Replied by APE Jay on topic Head Crack
The very first Z1s had a larger exhaust seat in them. You could put 32mm valves in them. However, all of them must have cracked from the seat to the spark plug hole, so Kawasaki went with a smaller OD seat to give it more room. But they still do that.

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16 Nov 2012 21:28 #558723 by kzz1king
Replied by kzz1king on topic Head Crack
IMA going to pullmine and check :cheer:
74 Z1 1075, 29 smoothbores, owned and ridden since 1976
Home built KZ1000 turbo setup

www.kzrider.com/forum/11-projects/532476...s-budget-turbo-build

www.kzrider.com/forum/11-projects/532489-74-z-makeover

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  • wireman
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17 Nov 2012 00:00 #558736 by wireman
Replied by wireman on topic Head Crack
Ive got several z1 heads and none of them are cracked between the seats,Im not aware of any of my kz heads having that problem either. B)
posting from deep under a non-descript barn in an undisclosed location southwest of Omaha.

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18 Nov 2012 21:02 #559027 by Galactica
Replied by Galactica on topic Head Crack
I have a kz900 head with a crack between the exhaust valve and the spark plug on the #3 chamber.
77KZ1000
76 KZ900

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  • guitargeek
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26 Nov 2012 18:28 #560142 by guitargeek
Replied by guitargeek on topic Head Crack

APE Jay wrote: Most of the KZ heads that come thru the shop are like that. Unless you are turboing it of running big nitrous load, you won't have a problem with it.


I was sure glad to read this last night! I had a bad moment when I found these:

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1980 KZ750-H1 (slightly altered)
1987 KZ1000-P6 "Ponch"
1979 GS1000 "Dadzuki"

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