73 Z1 mutt/mixed breed Build

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09 May 2024 15:27 #898806 by Coyote
Replied by Coyote on topic 73 Z1 mutt/mixed breed Build
Thank you, I haven't evaluated the cylinders yet. The engine would not turn by hand initially and I didn't want to try to force it. So after I removed the head noticed some moderate rusting in two cylinders that was keeping it from moving. So I just soaked it down with penetrating the oil. Let it sit a day. Rock the crank back and forth. After 2 or 3 days it became free. Just glad to know I don't have to worry about balancing if I have to go another bore over.

77 KZ 1000 A
21 Z900 RS
Project 73 Z1

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09 May 2024 15:35 #898807 by Mikaw
Replied by Mikaw on topic 73 Z1 mutt/mixed breed Build
Zed is by far the expert here, FWIW I agree they look like Wiseco. The ones I have are very similar in construction but a newer version so the identification on the top is different. 






1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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09 May 2024 15:39 #898808 by Mikaw
Replied by Mikaw on topic 73 Z1 mutt/mixed breed Build
Here’s an option if the bores will clean up with a .5mm cut. 

www.z-power.co.uk/piston-kit-1030cc-z1-z1000

1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.
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09 May 2024 19:19 #898819 by Coyote
Replied by Coyote on topic 73 Z1 mutt/mixed breed Build
Nice! Thanks for the link 

77 KZ 1000 A
21 Z900 RS
Project 73 Z1

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10 May 2024 06:26 #898826 by slmjim+Z1BEBE
Replied by slmjim+Z1BEBE on topic 73 Z1 mutt/mixed breed Build
That's a nice tank!

Looks like later ('74 and on), long emblems.  If you remove one, you may find that there's two sets of threaded holes for mounting emblems.  The more closely-spaced holes should accept the shorter '73 emblems.

Are there any characters (date code) stamped on the bottom of the rear hold-down tab?  There's some limited documentation of those codes available.

Good Ridin'
slmjim & Z1BEBE

A biker looks at your engine and chrome.
A Rider looks at your odometer and tags.

1973 ('72 builds) Z1 x2
1974 Z1-A x2
1975 Z1-B x2
1993 CB 750 Nighthawk x2
2009 ST1300A

www.kawasaki-z-classik.com
An enthusiast's forum focused exclusively
on all things Z1, Z2 and KZ900.

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10 May 2024 07:05 #898830 by Coyote
Replied by Coyote on topic 73 Z1 mutt/mixed breed Build
I'll check, I did a quick scan for numbers on it earlier and didn't notice any but now I know where to look, I'll check again.

77 KZ 1000 A
21 Z900 RS
Project 73 Z1

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10 May 2024 11:07 #898844 by Coyote
Replied by Coyote on topic 73 Z1 mutt/mixed breed Build
Don't see any. Any other way to identify if it is OEM Kawasaki?

77 KZ 1000 A
21 Z900 RS
Project 73 Z1

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11 May 2024 04:38 #898875 by slmjim+Z1BEBE
Replied by slmjim+Z1BEBE on topic 73 Z1 mutt/mixed breed Build
Serpentine inside seam.  Sure looks OEM.  We'll have to dig around in the pics we have access to.  Short on time this morning, so tomorrow or Monday.

Good Ridin'
slmjim & Z1BEBE

A biker looks at your engine and chrome.
A Rider looks at your odometer and tags.

1973 ('72 builds) Z1 x2
1974 Z1-A x2
1975 Z1-B x2
1993 CB 750 Nighthawk x2
2009 ST1300A

www.kawasaki-z-classik.com
An enthusiast's forum focused exclusively
on all things Z1, Z2 and KZ900.

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11 May 2024 10:58 #898887 by Cra-z1
Replied by Cra-z1 on topic 73 Z1 mutt/mixed breed Build
If your comparing an OEM form a reproduction just compare the weight . OEM tanks are a bit heavier
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14 May 2024 20:57 - 14 May 2024 21:04 #899070 by slmjim+Z1BEBE
Replied by slmjim+Z1BEBE on topic 73 Z1 mutt/mixed breed Build
We were wrong about date stamps on the hold down tabs.

It's been a while since we looked into them.  There was an extended discussion about them on the Z1-classik forum some years ago.  Don't remember the details, but IIRC, nothing definitive ever came of the discussion.  Tellingly, there's absolutely nothing about tank code stamps in John Brookes' sixth edition Z1 Restorer's Handbook.  He's working on the 7th. edition now.  We'll PM on the classik forum & ask if he has any new info.

We pulled every Z1 tank we have.  Not surprisingly, they only muddy the waters further.

Repop green for a '73 Z1.  We bought this with a complete tankset from Z1 Enterprises when Jeff still owned it.  Nothing to see except different tab construction than Mama Kaw's.


OEM '73 Jaffa.  A spare we bought decades ago.  Still looking for the right bike to put it on.  No code stamps on the tab, but note the two holes inline with the tab..


Detail of the tank above.  We're back to holes.


Another '73 Jaffa.  This one came on our '73 rider.  Two holes missing. No code.


OEM Green 74 Z1-A that slmjim bought new.  No code. No holes.


OEM red '74 Z1-A.  Apologies for the poor pic.  This tank has fuel in it & we couldn't turn it upside down. Those aren't holes inline with the tab, they're spot welds.


OEM blue '75 Z1-B.  Holes & code stamping.


Detail of the tank above.  Holes & '1216' code.


OEM blue replacement tank produced during / after '76 with the KZ900 "outside seam"-pattern tank.


Detail of the tank above.  Holes apparently used for locators on underlying dimples.  '7H25' code stamp.


OEM red '75 Z1-B.  Code stamp & holes.. 


Detail of tank above.  '2 25' code & holes.


We'll hazard an educated guess that Coyote's tank was produced prior to '75, when stampings began.  Key word there is 'guess'.

This is arcane eyes-glaze-over stuff.  It's late. Going to bed.

Good Ridin'
slmjim & Z1BEBE

A biker looks at your engine and chrome.
A Rider looks at your odometer and tags.

1973 ('72 builds) Z1 x2
1974 Z1-A x2
1975 Z1-B x2
1993 CB 750 Nighthawk x2
2009 ST1300A

www.kawasaki-z-classik.com
An enthusiast's forum focused exclusively
on all things Z1, Z2 and KZ900.

Last edit: 14 May 2024 21:04 by slmjim+Z1BEBE.
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24 May 2024 13:50 #899660 by Coyote
Replied by Coyote on topic 73 Z1 mutt/mixed breed Build
Short update, got the crankshaft and transmission inspected, had to replace two or three bearings. Case halves are back together. Honed the cylinders and painted them today. Probably get the crankcase painted tomorrow or the next day.

Quick question, does anybody know the length of the clutch push rod? Of the three motors I tore down, 83, 79, and 73, only the 83 had a clutch push rod. It's 8 mm. The other two use 7 mm but I do not know the length.

77 KZ 1000 A
21 Z900 RS
Project 73 Z1
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24 May 2024 17:34 #899668 by Mikaw
Replied by Mikaw on topic 73 Z1 mutt/mixed breed Build
I think the “J” ‘83 push rod will be a two piece the “Z”/“Kz” is one piece. 

1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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