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M.unit to coils 12 Apr 2022 15:35 #865309

  • Jai88
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Hello everyone!

I have a stupid question which I’m hoping someone can answer..

but first some background info,
I’m about to start hardtailing/bobbing my 84?? zn750 ltd. I’m wanting to simplify the wiring and clean it all up with the M.unit blue and motogadget switches. 
I mostly understand the wiring until I get the the ignition system. 
my question is..

Can anyone explain the wiring between the M.unit and the coils?
do I have a contact breaker or an ignition control module of sorts, and how do I wire that together to make sure I get a spark at the correct time?

Thanks in advance

Jai

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M.unit to coils 12 Apr 2022 21:27 #865324

  • F64
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Pretty easy.... just run a wire from the "ignition" output on the m-unit to the positive terminal on your coil(s).
The coil negative wire will go to the contact breaker.

 I'm not sure about your wiring if you use an electronic ignition module.

photo:motogadget
 
81-KZ440-D2.
Louis Dudzik's GM HEI ignitor conversion installed 2015 s3.amazonaws.com/gpzweb/Ignition/GPZgmHEImod.html
Motogadget m-unit blue installed 2017.
LIC, NY
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M.unit to coils 24 May 2022 14:21 #867639

  • meubels
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I was wondering if this has solved your problems. I run an M-unit blue on a kz1100 with an IC igniter. If you would like I can share my wiring diagram...
1982 KZ1100A (shaft). Customized bike. Runs K&N airpods, stepped up carbs. Rebuilt wiring harness and an M-unit blue. Led lighting, Mosfet reg-rec, li-fe battery, new controls, home built saddle and fully new paint job. All this took me a few years... :-)

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M.unit to coils 24 May 2022 20:04 #867651

  • TexasKZ
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By 1984, all Kawasaki street bikes bigger than 100cc had electronic ignition, not breaker points.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

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M.unit to coils 25 May 2022 00:02 #867658

  • kzstreetfighter71
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Please share anything you have, always nice to share with the class. :)
06 Gsf 1200 bandit, 08 Triumph tiger 1010
05 Yam xv1700 , 02 Hon shadow 1100
1975 Z1 (currently working on)
1977 Z1000 ( running and in storage)
1978 Z1000 (currently working on)
1978 Z1r "skinny tank" (currently working on)
1978 Z1r "fat tank (gathering parts)
1979 z1000st (currently working on)

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M.unit to coils 25 May 2022 07:51 #867674

  • Wookie58
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Please share anything you have, always nice to share with the class. :)


 

One thing I would add is that personally I would only feed the coils from the "ign" output. Anything else that doesn't have a specific output on the M-unit I would feed from one of the "aux" ports. The reason for this is the coils alone can draw close to the 10 amp rating of the M-unit output and given the cost of these unit's I wouldn't want to risk overloading it (even though it has built in protection) The below calculation shows the current draw of the coils and as you can see with coils that are close to 3 ohms resistance the draw is 9 amps. This is of course only IMHO

 
1982 KZ1000 Ltd
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M.unit to coils 10 Jun 2022 02:50 #868598

  • Jai88
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Hi all,

sorry for the absence unfortunately my fiancée died at the beginning of June at the age of 33, so as you can all imagine the build has taken a back seat. 
Yeah my 750 is breaker point but any wiring diagrams you have would still be fantastic as the more I learn the more I know. 

kindest regards,

Jai

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M.unit to coils 10 Jun 2022 03:15 #868600

  • Wookie58
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Sorry to hear that Jai, devastating for sure. We all love our bikes but there is "a time and a place" and you need to get your priorities right. Any support you need with electrics etc (or anything else) we are here to help.
1982 KZ1000 Ltd
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M.unit to coils 10 Jun 2022 10:07 #868609

  • TexasKZ
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I am very sorry for your loss.

When you are up to it, would you mind posting the engine number? I am curious because I am not aware of any KZ750 four cylinder engine that came with breaker points. Maybe I am ignorant, or maybe there is a mystery here.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

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M.unit to coils 10 Jun 2022 11:20 #868612

  • Jai88
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Hi Tex,

sorry I misread your reply.
I have an ic ignition box and I’m guessing there’s sensors on the crank?

cheers,
Jai

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M.unit to coils 10 Jun 2022 14:52 #868615

  • TexasKZ
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That is what I would expect.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

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M.unit to coils 20 Jun 2022 14:17 #869118

  • Jai88
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Can you of you gents have a look over this and tell me if it looks correct,

also I’ve got 3 cables out of my rec/reg,
1: black yellow (I assume ground)
2: brown white (live?)
3: white ??
can anyone help in identifying them so I can update the diagram

 Cheers everyone
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