Dead stator? 1990 Rz350

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CanadianRZ350
Posts: 64
Joined: Sat Jan 02, 2016 4:01 am
Location: Pickering, Ontario

Dead stator? 1990 Rz350

#1 Post by CanadianRZ350 » Fri Sep 23, 2016 9:44 pm

Today I noticed that my battery suddenly was flat when I was leaving work. odd
Got home, checked the battery, only has 8 volts. it goes. upto 12.5 when running at 5k Rpm.
I swapped in a known good battery from my Rd400, has a standing voltage of 12.6-12.8 but stays at 12.5 when running.

I have tested the regulator/rectifier with my ohm meter, current only flows one way through each white wire when holding one lead on the red wire like it should.

Now the stator is suspect. I only get one reading of 001 between 2 white wires, but infinite with the others, any which way I try. leads swapped around too.

Image

Now i get the same infinite if i swap the leads around. I don't think this should matter though.

Image


I'm just looking for a second opinion. Is the stator toast?

The bike still runs fine but the lights are dim at idle

Thanks for your time

RuZty
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Posts: 3584
Joined: Fri Oct 03, 2003 11:11 pm
Location: Southern Ontario, Canada

Re: Dead stator? 1990 Rz350

#2 Post by RuZty » Fri Sep 23, 2016 11:45 pm

Check all connections where the wires come out the back of the connector block. I have had a wire down to the last few strands cause some funky things to happen.
This is a good resource for trouble shooting electrical problems; http://www.electrosport.com/technical-r ... ding-guide" onclick="window.open(this.href);return false;

CanadianRZ350
Posts: 64
Joined: Sat Jan 02, 2016 4:01 am
Location: Pickering, Ontario

Re: Dead stator? 1990 Rz350

#3 Post by CanadianRZ350 » Fri Sep 23, 2016 11:57 pm

RuZty wrote:Check all connections where the wires come out the back of the connector block. I have had a wire down to the last few strands cause some funky things to happen.
This is a good resource for trouble shooting electrical problems; http://www.electrosport.com/technical-r ... ding-guide" onclick="window.open(this.href);return false;
Yup I checked the front and back of each connector.
That's a pretty good write up there, I will try those tests tomorrow and see what happens

MK
Posts: 814
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Location: Wolfenbüttel, Germany
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Re: Dead stator? 1990 Rz350

#4 Post by MK » Sat Sep 24, 2016 2:47 pm

The 3 white wires are for creating the 12V to charge the bat and run the lights.
If one of them is faulty you'd have what you describe, i.e. bike runs, but no 12V supply (nominal value is 0.6 ohm)
In that case your stator needs to be replaced.

In case you talked about the source coil:

1) Set your meter to 200 ohms, not 2k
2) Measure red, green, brown that's the source coil.

You have to measure 3 different combinations. If one branch of the coil is faulty, you should read 2 infinite values and one that is close to spec (either around 5 ohms or something between 130 and 230 ohm)

If it really is the source coil, my default advice is to get a DC CDI as this doesn't require the source coils.
Prices are in the 200 Eur region which is around double that you'd spend on a used stator or on a rewinding. In exchange you get around plus 5 hp even on stock engines - tuned ones benefit even more.
Bye
Martin

CanadianRZ350
Posts: 64
Joined: Sat Jan 02, 2016 4:01 am
Location: Pickering, Ontario

Re: Dead stator? 1990 Rz350

#5 Post by CanadianRZ350 » Sat Sep 24, 2016 4:37 pm

MK wrote:The 3 white wires are for creating the 12V to charge the bat and run the lights.
If one of them is faulty you'd have what you describe, i.e. bike runs, but no 12V supply (nominal value is 0.6 ohm)
In that case your stator needs to be replaced.

In case you talked about the source coil:

1) Set your meter to 200 ohms, not 2k
2) Measure red, green, brown that's the source coil.

You have to measure 3 different combinations. If one branch of the coil is faulty, you should read 2 infinite values and one that is close to spec (either around 5 ohms or something between 130 and 230 ohm)

If it really is the source coil, my default advice is to get a DC CDI as this doesn't require the source coils.
Prices are in the 200 Eur region which is around double that you'd spend on a used stator or on a rewinding. In exchange you get around plus 5 hp even on stock engines - tuned ones benefit even more.

Hey I measured the source coil wires going into the stator.
red and green - infinite
brown and green - infinite
brown and red - 5.9

i have taken pictures of the source coil wires and also the 3 white wires again


Image
Image
Image

MK
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Re: Dead stator? 1990 Rz350

#6 Post by MK » Sun Sep 25, 2016 2:09 pm

For the three white cables that's the confirmation that you'd need a new stator or a rewind.

For red/green/brown I may have to add to my advise on using the 200 ohm range.
If the value is higher than the range (200 in this case), some meters show "infinite" which can lead to false conclusion.
Repeat the measurement with the 2k range and I'm pretty sure it will not show infinite (otherwise your bike wouldn't run ...)

If you need to measure more often, you may invest some 40 bucks in a meter that has an auto-range function.
https://www.youtube.com/watch?v=gh1n_ELmpFI" onclick="window.open(this.href);return false;
Bye
Martin

CanadianRZ350
Posts: 64
Joined: Sat Jan 02, 2016 4:01 am
Location: Pickering, Ontario

Re: Dead stator? 1990 Rz350

#7 Post by CanadianRZ350 » Sun Sep 25, 2016 7:33 pm

I'll have to get it rewound forsure.

I went over to my buddys place to compare readings on his 1990 Rz350 basket case/project
and here is what I got

I had gotten infinite on my bike for these wires
Image

I had 5.9 on mine
Image

I had infinite
Image

Had 0.9 on mine
Image

This was infinite on mine
Image


Does anyone know of a good place in Canada I can send it to get rewound?

Thanks

bitzz
Posts: 121
Joined: Fri Feb 17, 2012 10:54 pm
Location: Omemee, Canada

Re: Dead stator? 1990 Rz350

#8 Post by bitzz » Mon Sep 26, 2016 12:11 pm

No one local to Pickering.
There is Earl (Proformance Cycle 519 942 2082, up near Orangeville), but he hand winds them... with varying results.
Rick's electric is a better bet.

I probably have a used one. I am in Omemee, just north east of Pickering.

email is best
jim at bitzz dot com

whyzee79
Posts: 99
Joined: Tue Jul 23, 2013 2:16 pm

Re: Dead stator? 1990 Rz350

#9 Post by whyzee79 » Mon Sep 26, 2016 1:21 pm

RM stator is out of Canada around the Montreal area I believe. I have dealt with him before and the customer service was good. He can rewind coils but you should be able to find someone local to do it like an alternator/generator repair shop.

CanadianRZ350
Posts: 64
Joined: Sat Jan 02, 2016 4:01 am
Location: Pickering, Ontario

Re: Dead stator? 1990 Rz350

#10 Post by CanadianRZ350 » Tue Sep 27, 2016 2:20 pm

Thanks for pointing me to RmStator, I called them and they said its $250 to rewind it.
I'm going to take it off the bike today and ship it out.
I didn't want to take a chance with a used one because this bike is my daily ride and I ride 10,000 km+ per year.

As always thanks for the help :smt002

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