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Pic request for back of frame 79 kz400
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05 Sep 2025 09:06 #916811
by amyers49
1979 KZ400
Pic request for back of frame 79 kz400 was created by amyers49
HI all,
I have recently purchased a 79 kz400 that the PO had started to build into a cafe racer. I am restoring it to factory condition, but the rear end of the frame was modified.
The parts manual doesn't show where the seat brackets attach. If anyone can send me a photo of the frame showing where the seat brackets, latch, and rear frame arch are
so that I can fab and weld them, I would be grateful.
Thanks,
Alan
I have recently purchased a 79 kz400 that the PO had started to build into a cafe racer. I am restoring it to factory condition, but the rear end of the frame was modified.
The parts manual doesn't show where the seat brackets attach. If anyone can send me a photo of the frame showing where the seat brackets, latch, and rear frame arch are
so that I can fab and weld them, I would be grateful.
Thanks,
Alan
1979 KZ400
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05 Sep 2025 12:34 #916829
by Injected
1978 KZ650B2 w 1197cc Z1 engine
1977 KZ650B1 w 750cc Spectre engine
1979 KZ650C3 w 831cc Hot Rod engine
1978 KZ650C2 w 762cc DFI project
1977 KZ650C1 stock restoration project
1978 KZ650B2 modified project
1978 KZ650B2 Injected Drag 831cc
1980 Z1 Custom Frame Drag 1327cc
1981 Z50R Honda tow bike
Replied by Injected on topic Pic request for back of frame 79 kz400
1978 KZ650B2 w 1197cc Z1 engine
1977 KZ650B1 w 750cc Spectre engine
1979 KZ650C3 w 831cc Hot Rod engine
1978 KZ650C2 w 762cc DFI project
1977 KZ650C1 stock restoration project
1978 KZ650B2 modified project
1978 KZ650B2 Injected Drag 831cc
1980 Z1 Custom Frame Drag 1327cc
1981 Z50R Honda tow bike
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05 Sep 2025 15:23 #916832
by Nerdy
Hi Alan - welcome!
I can provide a pic with measurements, but it will probably be tomorrow afternoon or so.
1979 KZ400 Gifted to a couple of nephews
1967 Yamaha YCS1 Bonanza
1980 KZ440B
1981 Yamaha XT250H
1981 KZ440 LTD project bike
1981 GPz550
2013 Yamaha FZ6R
Replied by Nerdy on topic Pic request for back of frame 79 kz400
HI all,
I have recently purchased a 79 kz400 that the PO had started to build into a cafe racer. I am restoring it to factory condition, but the rear end of the frame was modified.
The parts manual doesn't show where the seat brackets attach. If anyone can send me a photo of the frame showing where the seat brackets, latch, and rear frame arch are
so that I can fab and weld them, I would be grateful.
Hi Alan - welcome!
I can provide a pic with measurements, but it will probably be tomorrow afternoon or so.
1967 Yamaha YCS1 Bonanza
1980 KZ440B
1981 Yamaha XT250H
1981 KZ440 LTD project bike
1981 GPz550
2013 Yamaha FZ6R
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06 Sep 2025 18:22 - 06 Sep 2025 18:29 #916857
by Nerdy
1979 KZ400 Gifted to a couple of nephews
1967 Yamaha YCS1 Bonanza
1980 KZ440B
1981 Yamaha XT250H
1981 KZ440 LTD project bike
1981 GPz550
2013 Yamaha FZ6R
Replied by Nerdy on topic Pic request for back of frame 79 kz400
These are measured with the end of the tape against the back of the rear fuel tank support, where the frame narrows. Hope they help!
Edit: sorry they're so dark - not sure why that happened
Rear seat hinge
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Front seat hinge
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Helmet hook
Edit: sorry they're so dark - not sure why that happened
Rear seat hinge
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Front seat hinge
-
Helmet hook
1967 Yamaha YCS1 Bonanza
1980 KZ440B
1981 Yamaha XT250H
1981 KZ440 LTD project bike
1981 GPz550
2013 Yamaha FZ6R
Last edit: 06 Sep 2025 18:29 by Nerdy.
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10 Sep 2025 10:13 #916976
by amyers49
1979 KZ400
Replied by amyers49 on topic Pic request for back of frame 79 kz400
Thank you so much! I hate to be a pain, but if possible could you send pics and measurements of the tail of the frame from the rear shock mounts to termination including cross brace?
The PO cut off the rest of the frame just aft of the shocks, ugh!
Thanks,
Alan
The PO cut off the rest of the frame just aft of the shocks, ugh!
Thanks,
Alan
1979 KZ400
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11 Sep 2025 19:40 #917042
by Nerdy
Sure, no worries! Please give me a day or two but I'll get 'em
1979 KZ400 Gifted to a couple of nephews
1967 Yamaha YCS1 Bonanza
1980 KZ440B
1981 Yamaha XT250H
1981 KZ440 LTD project bike
1981 GPz550
2013 Yamaha FZ6R
Replied by Nerdy on topic Pic request for back of frame 79 kz400
Thank you so much! I hate to be a pain, but if possible could you send pics and measurements of the tail of the frame from the rear shock mounts to termination including cross brace?
The PO cut off the rest of the frame just aft of the shocks, ugh!
Sure, no worries! Please give me a day or two but I'll get 'em
1967 Yamaha YCS1 Bonanza
1980 KZ440B
1981 Yamaha XT250H
1981 KZ440 LTD project bike
1981 GPz550
2013 Yamaha FZ6R
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12 Sep 2025 09:53 #917064
by Nerdy
1979 KZ400 Gifted to a couple of nephews
1967 Yamaha YCS1 Bonanza
1980 KZ440B
1981 Yamaha XT250H
1981 KZ440 LTD project bike
1981 GPz550
2013 Yamaha FZ6R
Replied by Nerdy on topic Pic request for back of frame 79 kz400
I don't know what your timeline is for the project, but if you can give me a few weeks (have some temp medical restrictions) I will remove and send you the whole top portion of the frame (from the tank mount back to the tail) for free. I would just ask that you cover shipping.
That would probably be a lot easier on your end than trying to get the seat tabs, etc. lined up exactly right.
I'm not going to be using that frame and it's much better that some of it goes to someone who can.
That would probably be a lot easier on your end than trying to get the seat tabs, etc. lined up exactly right.
1967 Yamaha YCS1 Bonanza
1980 KZ440B
1981 Yamaha XT250H
1981 KZ440 LTD project bike
1981 GPz550
2013 Yamaha FZ6R
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13 Sep 2025 18:29 #917113
by amyers49
1979 KZ400
Replied by amyers49 on topic Pic request for back of frame 79 kz400
That would be awesome! Yes, thank you very much.
Let me know when you're ready.
Alan
Let me know when you're ready.
Alan
1979 KZ400
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14 Sep 2025 11:03 #917151
by Nerdy
1979 KZ400 Gifted to a couple of nephews
1967 Yamaha YCS1 Bonanza
1980 KZ440B
1981 Yamaha XT250H
1981 KZ440 LTD project bike
1981 GPz550
2013 Yamaha FZ6R
Replied by Nerdy on topic Pic request for back of frame 79 kz400
Great! Let me know if you have preferences for cutoff points
1967 Yamaha YCS1 Bonanza
1980 KZ440B
1981 Yamaha XT250H
1981 KZ440 LTD project bike
1981 GPz550
2013 Yamaha FZ6R
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15 Sep 2025 07:15 #917186
by amyers49
1979 KZ400
Replied by amyers49 on topic Pic request for back of frame 79 kz400
Not really, I need the arched piece under the seat and everything aft of that. My frame ends just where the triangle gussets are at the rear shocks. The seat hinges would be nice
but not absolutely necessary. I could send you a pic of my frame if it would help your decision.
but not absolutely necessary. I could send you a pic of my frame if it would help your decision.
1979 KZ400
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18 Sep 2025 20:51 #917368
by Nerdy
1979 KZ400 Gifted to a couple of nephews
1967 Yamaha YCS1 Bonanza
1980 KZ440B
1981 Yamaha XT250H
1981 KZ440 LTD project bike
1981 GPz550
2013 Yamaha FZ6R
Replied by Nerdy on topic Pic request for back of frame 79 kz400
Nah, that's okay - the description made it clear
If it works for you, I'll cut the frame piece off an inch or so below the triangular gusset, rather than behind it: that will keep the whole top seat-supporting area in one piece with existing factory dimensions from front to back
If it works for you, I'll cut the frame piece off an inch or so below the triangular gusset, rather than behind it: that will keep the whole top seat-supporting area in one piece with existing factory dimensions from front to back
1967 Yamaha YCS1 Bonanza
1980 KZ440B
1981 Yamaha XT250H
1981 KZ440 LTD project bike
1981 GPz550
2013 Yamaha FZ6R
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