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1973 Z1 Maui 14 Dec 2021 08:12 #859063

  • Mikaw
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Correct on the brn/wht, and the dual female brown. Extra not needed. Good for accessories.

www.wgcarbs.com/index.php/using-joomla/e...-categories/89-coils

Here’s the Wired George relay schematic 

 
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.
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1973 Z1 Maui 14 Dec 2021 12:58 #859076

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Cool! I may do that.
Melekalikimaka

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1973 Z1 Maui 14 Dec 2021 17:28 #859087

  • hardrockminer
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Cool! I may do that.
Melekalikimaka

That could be a great song!
 

I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.

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1973 Z1 Maui 15 Dec 2021 06:15 #859094

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What is the relay for the coils for? Does it keep the current from going through the handlebar controls?
 

Z1/KZ ignition switches, and motorcycle ignition circuits in general can introduce voltage drop at the coil primaries, reducing spark energy.

  The relay bypasses the ignition and kill switches, in order to supply full battery power direct to the coils through the NO relay contacts, while still retaining operation of the kill switch.  The harness we developed is plug & play, with no butchering/cutting/crimping of any OEM wiring necessary; we just crimp matching bullet and ring connectors the the relay harness and battery power connections, respectively.  The relay harness can be simply unplugged from the main harness and coil wiring, enabling the bike to be returned to it's factory original wiring configuration in under ten minutes after the tank is removed.

We were compelled during the resto of our '72 Z1, 'The Seven Year _itch', to disassemble an OEM ignition switch to correct an intermittent issue.  The internal construction we found suggests that the design of the rotary contacts was barely adequate, at best, for the current load imposed, particularly on the circuit feeding 12V to the coils.  See our post linked below:
kzrider.com/forum/4-electrical/606810-z-...-and-troubleshooting

Good Ridin'
slmjim & Z1BEBE
A biker looks at your engine and chrome.
A Rider looks at your odometer and tags.

1972 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.

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1973 Z1 Maui 15 Dec 2021 06:52 #859097

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If this is a restoration that's going to be ridden vs displayed, I'd go with a modern wiring harness.

PMC makes this one:

japan.webike.net/products/1523082.html

it's pricey, but I'll never go back to an OEM harness on an old bike.  I have it on mine and it's been nothing but amazing.

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1973 Z1 Maui 15 Dec 2021 07:10 #859098

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That really looks nice. I may need to try that.

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1973 Z1 Maui 15 Dec 2021 07:53 #859102

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That really looks nice. I may need to try that.
 

here's a write-up I did including lessons learned:

kzrider.com/forum/4-electrical/608400-pm...s-install-and-review

It has an accessory power connection at the headlight too, which is nice.

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1973 Z1 Maui 15 Dec 2021 13:53 #859121

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The Sohc Hondas suffer from similar electrical issues. I think I will solder up a relay for the start circuit on this Z1, seems like a safe thing to do for increased reliability. Thank you all for the great information. 

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1973 Z1 Maui 15 Dec 2021 16:20 #859134

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I did the Wired George relay addition to my 1980 KZ1000 and it runs perfectly.  I bought a second kit to put on my Z1B but I've never installed it.  Maybe this summer.  
I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.

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1973 Z1 Maui 16 Dec 2021 13:32 #859174

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I’m looking over details on the carb hoses.
the bowl overflows gather together and drop down over the back of the motor toward the swing arm.
where do the two 6.5mm bowl vents go besides just up? They are listed as 140mm long in Brookes. 
thank you

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1973 Z1 Maui 16 Dec 2021 13:38 #859175

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On another note
i am trying to get a machinist friend of mine to make me a set of the nylon choke plunger collars. If he is interested I may try to get him to make more of whichever style someone needs, would any of you be interested?
The following user(s) said Thank You: Mikaw

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1973 Z1 Maui 16 Dec 2021 16:37 #859180

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Yes, just up...towards the front of the air intake.  On later models there is a hole in the brace just in front of the airbox where I put the ends of mine.

Can you flash a photo of the nylon choke thingys?  I think yours are different from later versions.  But if not, there are several people selling new ones on ebay.

Search this part number on ebay.  293416898481



 
I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.

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