Kz 400 Ltd problem

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02 Sep 2016 08:04 - 02 Sep 2016 08:05 #740892 by Patton
Replied by Patton on topic Kz 400 Ltd problem
Let us know if wanting to have just enough ignition wiring to start and run the engine, without needing any chassis wiring.

This would be basically a total loss ignition system without using any charging system components, as sometimes used in road racing.

Good Fortune! :)

1973 Z1
KZ900 LTD
Last edit: 02 Sep 2016 08:05 by Patton.

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02 Sep 2016 08:22 #740894 by Edgytaff
Replied by Edgytaff on topic Kz 400 Ltd problem
Hi guys it does have kick start and turns over with jump leads on starter motor, I'd like to know how to wire it up to start it tho just to hear it running before I start spending out on it cheers

Kz 400 ltd,
Gt 750 trike ,
454 ltd,
Cb 250 super dream ,

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02 Sep 2016 08:32 #740899 by Nerdy
Replied by Nerdy on topic Kz 400 Ltd problem

Edgytaff wrote: Hi guys it does have kick start and turns over with jump leads on starter motor, I'd like to know how to wire it up to start it tho just to hear it running before I start spending out on it cheers


D'oh - my fault. I looked at this pic (yeah, I know) and didn't see a kickstarter. That, and I thought the LTDs in general didn't have them. :-)



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

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02 Sep 2016 08:56 - 02 Sep 2016 09:01 #740908 by Patton
Replied by Patton on topic Kz 400 Ltd problem

Edgytaff wrote: Hi guys it does have kick start and turns over with jump leads on starter motor, I'd like to know how to wire it up to start it tho just to hear it running before I start spending out on it cheers


The ignition coil should have a small "signal" wire attached to one of its primary terminals.
The other end of the signal wire attaches to the points or electronic ignition, stock or otherwise.

With a good fully charged battery, connect negative post to engine, and connect positive post to the other ignition coil primary terminal.

Th above is like what happens when the key is turned ON in a normal ignition switch.
So don't leave it hooked up like this with power to the ignition coil except when actively trying to start the engine -- use the kick starter -- and while the engine is running.

The signal wire serves to ground the coil through closed points or electronic ignition, stock or otherwise.
While so grounded, the ignition coil "charges" with the battery power passing through the coil

When the points open or the electronic ignition interrupts the coil's ground through the signal wire, the ignition coil becomes "ungrounded" which causes the coil to fire through the spark plug wires.

With a good fully charged battery, the engine should run for several hours.

Good Fortune! :)

1973 Z1
KZ900 LTD
Last edit: 02 Sep 2016 09:01 by Patton.

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02 Sep 2016 09:05 #740911 by Edgytaff
Replied by Edgytaff on topic Kz 400 Ltd problem
Thanks any idea what colour wire from coil I should connect up please

Kz 400 ltd,
Gt 750 trike ,
454 ltd,
Cb 250 super dream ,

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02 Sep 2016 09:36 #740915 by Patton
Replied by Patton on topic Kz 400 Ltd problem

Edgytaff wrote: Thanks any idea what colour wire from coil I should connect up please


The stock wire color between the points and the ignition coil primary terminal shows as Bl -- Blue -- on the wiring diagram.

The stock wire color between the battery positive post and the other ignition coil primary terminal shows on the wiring diagram as Red/Yellow, which R/Y wiring passes through various components such as fuses, connectors and switches.
And which relatively lengthy stock wire routing is avoided entirely by using the minimal ignition-only "hot wiring" technique earlier described with a wire running directly from the the positive battery post to the ignition coil primary terminal.

The hot wire can be in your choice of color! :woohoo: :lol: :lol:

Good Fortune! :)

1973 Z1
KZ900 LTD

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03 Sep 2016 01:44 #740963 by Edgytaff
Replied by Edgytaff on topic Kz 400 Ltd problem
OK il try that and let you know thanks alot you have been a big helo

Kz 400 ltd,
Gt 750 trike ,
454 ltd,
Cb 250 super dream ,

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03 Sep 2016 03:47 #740965 by Edgytaff
Replied by Edgytaff on topic Kz 400 Ltd problem
Hi found a 77, kz 400 starter relay would this be the same part as on my 79 kz 400 ltd and would the regulator be ok to use please

Kz 400 ltd,
Gt 750 trike ,
454 ltd,
Cb 250 super dream ,

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03 Sep 2016 03:50 #740966 by Edgytaff
Replied by Edgytaff on topic Kz 400 Ltd problem
Sorry above post it's a 75 kz 400 not 77

Kz 400 ltd,
Gt 750 trike ,
454 ltd,
Cb 250 super dream ,

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03 Sep 2016 21:55 #741026 by Patton
Replied by Patton on topic Kz 400 Ltd problem
Could check with various parts suppliers, as they often list all models that use a particular part.
Even ebay can sometimes be helpful when a seller lists the various model applications.

Good Fortune! :)

1973 Z1
KZ900 LTD

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04 Sep 2016 12:58 #741077 by Edgytaff
Replied by Edgytaff on topic Kz 400 Ltd problem
Hi tried wire straight to coil no spark any ideas please?

Kz 400 ltd,
Gt 750 trike ,
454 ltd,
Cb 250 super dream ,

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04 Sep 2016 23:37 #741137 by Patton
Replied by Patton on topic Kz 400 Ltd problem


No fire on plugs could result from various reasons, including:
bad ignition coil;
failure in the secondary loop;
failure of points to successively ground and unground the ignition coil;
signal wire issue;
etc.

With all components and connections being good, accompanied by positive voltage from a good fully charged battery connected to the coil, and the battery negative post connected to the engine, the coil will charge while the points are closed and fire when the points open.

Good Fortune! :)

1973 Z1
KZ900 LTD
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