73 vs 74 Z1 forks and valving

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18 May 2024 19:34 #899278 by sdinse
73 vs 74 Z1 forks and valving was created by sdinse
I would think that the change from the 73 design to 74 was for the better, but maybe not.  Does anyone know what the end result (ride quality) of the 74 valves was?

73
 

74
 

Steve
1973 Z1 Since New

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18 May 2024 20:44 - 18 May 2024 20:48 #899280 by Mikaw
Replied by Mikaw on topic 73 vs 74 Z1 forks and valving
I have rebuilt a dozen or so pairs of forks from 74-75 up to 1978 and haven’t seen the damper you show as a 1974 Z1. They all are like the 1973 example 

 

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.
Last edit: 18 May 2024 20:48 by Mikaw.

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19 May 2024 04:58 - 20 May 2024 05:00 #899290 by slmjim+Z1BEBE
Replied by slmjim+Z1BEBE on topic 73 vs 74 Z1 forks and valving
Both designs are pictured in John Brookes' book (fourth edition) & onward, and in Kawasaki BULLETIN SER 74 GEN -16 detailed below.

Scuttlebutt was that changes were made to improve damping, and also to eliminate the irritating 'thunk' heard that early forks could produce when striking abrupt, raised edges such as driveway entrances at low speed.

General Service BULLETIN SER 74 GEN -16 documents differences, special tool for dis / reassembly, and changes to PN #'s (attached below).  That bulletin also refers to BULLETIN SER 74 GEN 17 , which we done have.  (If anyone has BULLETIN SER 74 GEN 17, could you please post it?)  Thx.

This browser does not support PDFs. Please download the PDF to view it: Download PDF



Good Ridin'
slmjim & Z1BEBE

EDIT: posting as .jpg's.












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.

Attachments:
Last edit: 20 May 2024 05:00 by slmjim+Z1BEBE.
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19 May 2024 13:54 #899319 by sdinse
Replied by sdinse on topic 73 vs 74 Z1 forks and valving
Hmmmm . . .  I get this from clicking on that PDF link:ForbiddenYou don't have permission to access this resource.Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.


Any special reason for that?Thanks SlimJim & Z1BEBE, good info to know.  I will put in the updated assembly.

Steve
1973 Z1 Since New

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19 May 2024 14:04 #899321 by sdinse
Replied by sdinse on topic 73 vs 74 Z1 forks and valving
You can find GEN 17 here:   kawatriple.com/bulletins/74gen-17.pdf

 

Steve
1973 Z1 Since New
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19 May 2024 14:37 #899327 by sdinse
Replied by sdinse on topic 73 vs 74 Z1 forks and valving
OOPS!  
After looking at the service bulletins I appears I got my 73 - 74 labelling backwards.  Glad I have it straight now before I put it all back together.

Steve
1973 Z1 Since New

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20 May 2024 04:39 - 20 May 2024 04:57 #899357 by slmjim+Z1BEBE
Replied by slmjim+Z1BEBE on topic 73 vs 74 Z1 forks and valving

Hmmmm . . .  I get this from clicking on that PDF link:ForbiddenYou don't have permission to access this resource.Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.


Any special reason for that?Thanks SlimJim & Z1BEBE, good info to know.  I will put in the updated assembly.








 
Sorrry.  Our attachment-fu is stymied on this site sometimes. 
We attached that .pdf file two different ways, because we're not sure how the site handles .pdf files.  The live link seems broken.  There's also an icon at the bottom of the post that is the same .pdf file.  Clicking that enables downloading & viewing, or right-clicking enables 'save link as' function, at least on Firefox.

We'll re-scan as a .jpg. below & edit that other post if it's not too late.

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: 20 May 2024 04:57 by slmjim+Z1BEBE.

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20 May 2024 05:19 #899360 by Wookie58
Replied by Wookie58 on topic 73 vs 74 Z1 forks and valving
If you email it to me as a PDF I will put in on the filebase 

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20 May 2024 10:51 #899383 by sdinse
Replied by sdinse on topic 73 vs 74 Z1 forks and valving
Thank you so much!  These are much better quality than the ones I got from the Kaw Triples website.  It's all very clear now.  See what I did there?  Ha Ha  

Steve
1973 Z1 Since New
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21 May 2024 04:29 #899443 by slmjim+Z1BEBE
Replied by slmjim+Z1BEBE on topic 73 vs 74 Z1 forks and valving

If you email it to me as a PDF I will put in on the filebase 
 
If right clicking on the .pdf attachment (not the live link) & selecting 'save link as' doesn't work we can do that.  Send us an email & we'll attach in response.

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.

The following user(s) said Thank You: Wookie58

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21 May 2024 17:01 #899495 by Scirocco
Replied by Scirocco on topic 73 vs 74 Z1 forks and valving

Thank you so much!  These are much better quality than the ones I got from the Kaw Triples website.  It's all very clear now.  See what I did there?  Ha Ha  
          Kawatriple: 12-6-74 BULLETIN SER 74 GEN 17
slmjim+Z1BEBE : 10-30-74 BULLETIN SER 74 GEN 17

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