Is there any difference between a 1973 Z1 frame and a Z1a frame?
Thanks
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Z1 frames
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Z1streetfighter71
- ZedHead
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- Location: Galway-Eire
Re: Z1 frames
I think if my memory serves me, is there were differences in the frame gusset area, the older frames were prone to cracking here that spread to the down tubes.
Angus.
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Too many bikes to list.
Re: Z1 frames
Identical on Z1, Z1a and Z1b as far as I know. Only difference being the frame number..
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Re: Z1 frames
Z1streetfighter71 wrote:I think if my memory serves me, is there were differences in the frame gusset area, the older frames were prone to cracking here that spread to the down tubes.
Pretty sure the extra bracing didn't arrive 'til the A4. I thought Z1/A/B frames were the same??.
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Z1streetfighter71
- ZedHead
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Re: Z1 frames
On the black gusset there are holes this was the later 73 and 74, the yellow gusset has no holes and this is one of my 75' and i think and im open to be corrected the early 73 gusset was straight.
- 1974-kawasaki-z1-900-frame-6.jpg (50.1 KiB) Viewed 1932 times
Angus.
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Too many bikes to list.
Re: Z1 frames
You may well be correct but I do know there was extra bracing on the last A4. (my old 900).....
- Z1065.jpg (37.8 KiB) Viewed 1925 times
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Z1streetfighter71
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Re: Z1 frames
The Z900 and Z1000 both had thicker walled tubes and extra support on the gusset but like i said i think i remember reading about the early 73 (some call it the 72) that had a slightly different gusset to the later 73/74. Anyone out there with an early bike? Sorry nerding out a bit...
Angus.
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Too many bikes to list.
Re: Z1 frames
The oil cooler holes mentioned in the previous post were removed circa frame number 65000.
There was also another slot shaped hole added to the central brace (can be seen in the yellow frame pic). This started to appear circa Jan 1974
There was also another slot shaped hole added to the central brace (can be seen in the yellow frame pic). This started to appear circa Jan 1974
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Z1streetfighter71
- ZedHead
- Posts: 1031
- Joined: 16th Oct 2020
- Location: Galway-Eire
Re: Z1 frames
z2.john wrote:The oil cooler holes mentioned in the previous post were removed circa frame number 65000.
There was also another slot shaped hole added to the central brace (can be seen in the yellow frame pic). This started to appear circa Jan 1974
Thanks for that John, the only pic of an early 73 frame gusset is this one but i think the builder removed the oil cooler holes in the repair he did, maybe thats what i read and just picked it up as a straight gusset.
Angus.
Too many bikes to list.
Too many bikes to list.
Re: Z1 frames
The oil cooler holes were on there from day 1
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