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'75 KZ400 - Upgrade to combined R/R 24 Mar 2016 07:41 #717091

  • knitt31
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Hey all!
Starting wiring soon on my '75 KZ400.
I've got the stock regulator and rectifier that came with the bike, but I'd like to combine them into a single unit if possible.
Replacing because, well, they're old and I'd like a minty fresh charging system!

I guess my question is whether or not any old R/R for say a late model KZ440 would work on my bike. I know my bike has the field coil vs the permanent magnet, so I'm guessing that may come into play.

There are a couple options for aftermarket R/R's for the '75 for $120 or so, but that's a tough swallow..

Any direction appreciated!

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'75 KZ400 - Upgrade to combined R/R 27 Mar 2016 19:58 #717682

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Bump - Any wisdom?

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'75 KZ400 - Upgrade to combined R/R 27 Mar 2016 21:05 #717698

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It depends on the charging system. single phase or three.
Steve
Z1b1000 1975 Z1b
Opinions expressed by me do not reflect those of the the staff or members
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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'75 KZ400 - Upgrade to combined R/R 28 Mar 2016 05:24 #717721

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I don't know if this part will work with your bike. the item x-ref lists the 75 KZ400-D. but you'd need to verify.
SPI Voltage Regulator Motorcycle 12 Volt Electrical Kawasaki .
Sports Parts Inc 01-154-16. universal voltage regulator/rectifier.

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Last edit: by martin_csr.

'75 KZ400 - Upgrade to combined R/R 04 Apr 2016 09:20 #719206

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I've got three yellows coming out of my stator. I'm under the assumption that means it's a three phase.
Is it that simple?

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'75 KZ400 - Upgrade to combined R/R 04 Apr 2016 09:57 #719216

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I don't know much about the various charging systems, so I would check the alternator output voltage.
With multimeter set to AC & the motorcycle running at about 4,000 rpms, test the voltage at the yellow wires in pairs, 3 measurements total. On my 81 650 w 3-phase charging system, each reading should be about 50 VAC. @ 4000 rpm.

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'75 KZ400 - Upgrade to combined R/R 04 Apr 2016 10:14 #719224

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I recommend you contact the experts at Oregon Motorcycle Parts. Regulators and rectifiers are what they do, and they make really high quality products. Here's the link.....

www.oregonmotorcycleparts.com/Reg_rec_units.html
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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'75 KZ400 - Upgrade to combined R/R 04 Apr 2016 10:45 #719232

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The one in Martin's link does not have enough wires.

You are correct, you need a regulator designed for a field coil. More specifically, the regulator needs to control the positive voltage feed to the field coil. (Some KZ's have the regulator control the negative side of the field coil.)

You also have a 3-phase stator, so you would need a 3-phase rectifier.

You should be able to get both in a single unit, but sometimes it's nice to have separate units for troubleshooting.

I'm sure Oregonmotorcycleparts.com has what you need.

For the combo unit, in Ed's link, scroll down to part# VRREM7-KZ.

Or for individual Reg (which is much cheaper):
www.oregonmotorcycleparts.com/vregulators.html
Scroll down to part# VR3-KZ or VR3-KZ-3p (has factory plug added)

They also have a generic 3-phase rectifier, but you can get 50~100amp, 3-phase rectifiers on ebay all day long for less than $20.
The following user(s) said Thank You: KZQ

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Last edit: by loudhvx.

'75 KZ400 - Upgrade to combined R/R 06 Apr 2016 17:37 #719629

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Check ricks regulator/rectifiers same I put in my 75 kz400d

ricksmotorsportelectrics.com/part/10-320...WjQwMERzdGFuZGFyZA==

But then again it is 120 so....

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'75 KZ400 - Upgrade to combined R/R 12 Jun 2021 20:43 #850098

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Hey, i have a 75 kz400 on kick only, i have the same r/r from ricks motorsports and i dont have a diagram, care to share how you have yours wired? It would be greatly appreciated 

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