73 Z1 mutt/mixed breed Build
- Coyote
-
Topic Author
- Offline
- User
- Posts: 78
- Thanks: 23
Re: 73 Z1 mutt/mixed breed Build
09 May 2024 15:27
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
21 Z900 RS
Project 73 Z1
Please Log in or Create an account to join the conversation.
- Mikaw
-
- Offline
- Sustaining Member
- Posts: 4837
- Thanks: 1851
Re: 73 Z1 mutt/mixed breed Build
09 May 2024 15:35
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.
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.
Please Log in or Create an account to join the conversation.
- Mikaw
-
- Offline
- Sustaining Member
- Posts: 4837
- Thanks: 1851
Re: 73 Z1 mutt/mixed breed Build
09 May 2024 15:39
Here’s an option if the bores will clean up with a .5mm cut.
www.z-power.co.uk/piston-kit-1030cc-z1-z1000
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.
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.
The following user(s) said Thank You: Coyote
Please Log in or Create an account to join the conversation.
- Coyote
-
Topic Author
- Offline
- User
- Posts: 78
- Thanks: 23
Re: 73 Z1 mutt/mixed breed Build
09 May 2024 19:19
Nice! Thanks for the link
77 KZ 1000 A
21 Z900 RS
Project 73 Z1
21 Z900 RS
Project 73 Z1
Please Log in or Create an account to join the conversation.
- slmjim+Z1BEBE
-
- Offline
- User
- Enjoy Life! IT HAS AN EXPIRATION DATE!
- Posts: 1307
- Thanks: 801
Re: 73 Z1 mutt/mixed breed Build
10 May 2024 06:26
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
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
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
Please Log in or Create an account to join the conversation.
- Coyote
-
Topic Author
- Offline
- User
- Posts: 78
- Thanks: 23
Re: 73 Z1 mutt/mixed breed Build
10 May 2024 07:05
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
21 Z900 RS
Project 73 Z1
Please Log in or Create an account to join the conversation.
- Coyote
-
Topic Author
- Offline
- User
- Posts: 78
- Thanks: 23
Please Log in or Create an account to join the conversation.
- slmjim+Z1BEBE
-
- Offline
- User
- Enjoy Life! IT HAS AN EXPIRATION DATE!
- Posts: 1307
- Thanks: 801
Re: 73 Z1 mutt/mixed breed Build
11 May 2024 04:38
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
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
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
Please Log in or Create an account to join the conversation.
- Cra-z1
-
- Offline
- User
- Posts: 278
- Thanks: 219
Re: 73 Z1 mutt/mixed breed Build
11 May 2024 10:58
If your comparing an OEM form a reproduction just compare the weight . OEM tanks are a bit heavier
The following user(s) said Thank You: Coyote
Please Log in or Create an account to join the conversation.
- slmjim+Z1BEBE
-
- Offline
- User
- Enjoy Life! IT HAS AN EXPIRATION DATE!
- Posts: 1307
- Thanks: 801
Re: 73 Z1 mutt/mixed breed Build
14 May 2024 20:57 - 14 May 2024 21:04
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
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
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
Last edit: 14 May 2024 21:04 by slmjim+Z1BEBE.
The following user(s) said Thank You: Mikaw, BCScott
Please Log in or Create an account to join the conversation.
- Coyote
-
Topic Author
- Offline
- User
- Posts: 78
- Thanks: 23
Re: 73 Z1 mutt/mixed breed Build
24 May 2024 13:50
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.
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
21 Z900 RS
Project 73 Z1
The following user(s) said Thank You: Wookie58
Please Log in or Create an account to join the conversation.
- Mikaw
-
- Offline
- Sustaining Member
- Posts: 4837
- Thanks: 1851
Re: 73 Z1 mutt/mixed breed Build
24 May 2024 17:34
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.
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.
Please Log in or Create an account to join the conversation.