Author Topic: New 3V3 CDI  (Read 1521 times)

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Offline DynoTronix

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New 3V3 CDI
« on: February 18, 2017, 01:01:22 AM »
Hi Guys,
I’m planning to make a replacement for the 3V3-85540-10-00 CDI; however, my research has me puzzled about the “where used” list.  There are some bikes listed under the 3V3 where used list, but the same bikes are also listed under CDI numbers 3R3-85540-10-00 and 2X6-85540-10-00.  I compiled the table below to show what I’ve found.  I’m guessing that the 3V3 is the latest design and replaces the 3R3 and 2X6 models.  Does anyone have a take on this???

Now to confuse the issue further, I’ll use the 1977 YZ100D and YZ80D as examples.  Since the YZ100D is listed under the where used list for both the 2X6 or 3V3 CDIs, does that not imply that the YZ80D can also use the 3V3 CDI?

I would appreciate any and all input.

Best regards,

Bill


Offline Woody

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Re: New 3V3 CDI
« Reply #1 on: February 20, 2017, 08:42:09 PM »
sorry, I don't have an answer to your question Bill but I have been meaning to ask you a couple of questions;

Have you made up a CDI yet to suit the 1981 YZ250H 3R4-85540-10-00 ? I see that the earlier 1980 YZ250G has a different part number (3R4-84440-10-00) but I previously thought that they were the same.

Likewise, are the 1980 YZ125G (3R3-85540-10-00) and 1981 YZ125H (3R3-85540-11-00) compatible?

thanks for your time
Looking for Parts
IT200
YZ125G
YZ80G
YZ250H
CR250RD
CR250RD

Offline DynoTronix

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Re: New 3V3 CDI
« Reply #2 on: February 20, 2017, 11:59:27 PM »
sorry, I don't have an answer to your question Bill but I have been meaning to ask you a couple of questions;

Have you made up a CDI yet to suit the 1981 YZ250H 3R4-85540-10-00 ? I see that the earlier 1980 YZ250G has a different part number (3R4-84440-10-00) but I previously thought that they were the same.

Likewise, are the 1980 YZ125G (3R3-85540-10-00) and 1981 YZ125H (3R3-85540-11-00) compatible?

thanks for your time
Woody, I have not made a CDI yet for the 3R4, for either version.  I don't know how different they are, so I would have to get a couple of sample units to compare their circuitry.

Good question on the 3R3-85540-10-00 vs 11.  It looks like the 11 is only used on the YZ125H, but again, I would have to dissect a few to see what the differences are.

Since no one seems to have any experience with the compatibility of these units, I'm planning on getting one of each to do a comparison on the circuitry.  Maybe I'll get an 3R3-85540-11-00 as well to see how it differs from the 10. 

If anyone has any broken modules they would like to donate to the cause, that would be great!  ;D

I will report back when I know more.

Regards,

Bill

Offline Woody

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Re: New 3V3 CDI
« Reply #3 on: February 22, 2017, 09:00:03 PM »
I'm glad you know what you're doing Bill as it's all black magic to me. Good luck with your research. I'll have to read up on your IT CDI threads here and check out ur website.
cheers
Looking for Parts
IT200
YZ125G
YZ80G
YZ250H
CR250RD
CR250RD

Offline DynoTronix

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Re: New 3V3 CDI
« Reply #4 on: February 22, 2017, 11:42:32 PM »
I'm glad you know what you're doing Bill as it's all black magic to me. Good luck with your research. I'll have to read up on your IT CDI threads here and check out ur website.
cheers
Thanks, Woody.  I ordered one of each CDI type, including a 3R3-11.  It will probably take me about two to three weeks to evaluate.

Bill

Offline DynoTronix

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Re: New 3V3 CDI
« Reply #5 on: March 06, 2017, 09:15:26 AM »
Okay guys, I bought one of each CDI type.  I don't know if the electronics are the same yet, but it's obvious that the wiring isn't.  The 3R3-10 and 3R3-11 wiring is similar, but the ground wire on the -10 is a little longer and has a ring terminal with a short male bullet plug.  Both the -10 and -11 have one extra Black/red wire that just appears to loop back into the CDI.  I wonder what that's for...  Other than that, the -10 and -11 have the same plastic box.

I can't believe that the 3V3 is supposed to be compatible with the 3R3-10.  For one thing, the red wire on the 3R3-10 is female, but on the 3V3 the red wire is male.  The 3V3 case is aluminum, but roughly the same size as the 3R3-10 and -11. 

The 2X6 is totally different in size from the other three.  The case is the same style used on the 2W6 and 3R5 CDIs.  The wires on the unit in the photo are hacked, but I confirmed that they are the same genders as the 3R3-11.

I did a quick comparison of these units on the test engine, and I can tell you that they are not electrically the same.  Next, I have to do some more electrical testing to establish a performance baseline for each unit.  Then I start tearing them apart.  I should know more in a couple of weeks.

Best regards,

Bill



Offline DynoTronix

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Re: New 3V3 CDI
« Reply #6 on: April 27, 2017, 11:19:57 AM »
Update:

HI guys, sorry it's been awhile since I provided an update.

Sorting out all of these CDIs has turned out to be much more work than I thought.  I have done some more research and found that both HPI and Rex's offer CDIs to cover the 2X6 and 3V3 versions.  However, they don't agree on the compatibility list.  For example, Rex's shows that their YZ2 CDI is a replacement for the 3V3 and is the CDI to use on a 1980 YZ125G.  However on HPI's website, they claim their CD4114 is the module to use on the 1980 YZ125G, and replaces the 2X6, 3R3-10 and 3R3-11.  So basically one says 2X6 and the other says 3V3.  Who's right? :-\

So far I have dissected the 2X6 and 3V3 units, and I can tell you their trigger circuitry is very different.  The 2X6 has a much higher trigger threshold than the 3V3, and the timing is different between them as well.  IMO, if you install a 2X6 where a 3V3 should go, you might have a hard time starting your engine, and I don't think the performance would be very good either.  Of course, this is just my opinion. 

I have a lot more research to do before I can feel confident about the application list.  I also still need to dissect the 3R3-10 and -11 modules to see how different they are.

I have included a revised chart to show what HPI and Rex's are currently showing on their websites.

Best regards,

Bill

Offline DynoTronix

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Re: New 3V3 CDI
« Reply #7 on: May 18, 2017, 08:27:13 AM »
Update:

I finally have the test engine fitted with a proper stator and rotor for testing the 2X6 CDI.  I had to have the rotor mounting hole enlarged to fit the test engine shaft, and I had to raise the stator coils 6mm to center the rotor, but it all works great now. 

The 3V3 and 2X6 CDIs are close in design, but I decided to work on the 2X6 first.  I'll be starting a 2X6 thread soon, and let the 3V3 thread sit for awhile.  Not sure yet if I can use the 2X6 stator for testing the 3V3, but I'll work on that later.

Best regards,

Bill


Photo of the 2X6 rotor and stator mounted on my test engine.

Offline harko

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Re: New 3V3 CDI
« Reply #8 on: May 18, 2017, 04:43:04 PM »
Great work Bill, much appreciated.

Harko
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Offline Martin I Henry

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Re: New 3V3 CDI
« Reply #9 on: May 20, 2017, 04:27:03 PM »
Great work yet again Bill.
Looks like some more old Yamaha's will remain alive for a bit longer now!
Cheers,
Dave.