TCI Replacement 2020 It Works

[YamadudeXS650C]

I had a xj700 box on Old Brown and she would start and run but no ignition advance . I built a test rig to try and find out why and starting trying other cheap (china inc) boxes when I found the Gonzo box worked. The first Gonzo boxes cost me $8.00 on the smiley site so were much easier to find and cheaper than a used oem xs650 or xj box. And so it goes. And amazed that someone has read this thread since the beginning.

Perhaps we could ask ChatGPT to summarize it for us





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[joebgd]

Have we tried the gn pickup? I understand there is a rectangular metal on gn for a target?
I guess what I'm asking is there a pickup that will work advance correctly besides the original xs pickup. For pre tci set ups? I see the instructions in tech but I don't think it mentioned pickup.

 

[LanzSilva]

I got this gn250 box but it looks very different than the ones other members have.
Do I connect it the same?

 

[Jim]

I got this gn250 box but it looks very different than the ones other members have.
Do I connect it the same?

If it's a GN250 box, yes, they all connect the same.
Show us the outside of the box?

 

[LanzSilva]

If it's a GN250 box, yes, they all connect the same.
Show us the outside of the box?

No letters in the box.

 

[Jan_P]

I may be off here ..But that white stuff 1 st picture is that silicone that i supposed to be under the transistor
If i Recall right it has an heat transfer function and a washer is used under sometimes

https://www.diyaudio.com/community/threads/power-transistor-insulation.298087/

I also believe there usually is a screw in the hole clamping it down

https://www.xs650.com/threads/tci-box-a-successful-repair-electronic-ignition-ignitor.3289/

The machine is vibrating I would talk to the seller of the box.. Unless someone here on the forum
Knows more about this I have not been doing the read up so good

 

[Jim]

It looks like a GN250 box from the pic.

 

[GLJ]

It says GN250 on the board. I agree with Jan normally there is a screw holding down the transistor.

 

[Adamc]

No letters in the box.

Looks exactly like the China eBay GN250 units I have used.

 

[ckahleer]

That looks like a heat related failure waiting to happen. Put some heat sink compond under the transister and bolt it to the heat sink.
I find alot of Chineze stuff is like that. The build quality is so bad, you need to rework it before use.

 

[Melnic]

I agree, the white glue is to keep the caps from vibrating around. that's good, they let this one leave w/o securing that Voltage amp down. Typical of a lot of chinese clone manufacturing is to NOT involve good quality control.

 

[Jan_P]

I agree, the white glue is to keep the caps from vibrating around. that's good, they let this one leave w/o securing that Voltage amp down. Typical of a lot of chinese clone manufacturing is to NOT involve good quality control.

I also have that experience .sometimes one gets bad parts and goods But they never make any Problems helping you out to correct . I kind of like that say it is 5 -10 % wrong but immediately gets help
Compared to
Other perhaps 2 -5 -7 % wrong but not a Snowballs chance in hell to get it corrected Dont even answer

In this case it would perhaps help to know if the stock Ignition box have a screw there

 

[Team Junk]

Interestingly it differs inside compared to the one 2M sliced open for me.
Lanz
Can you get a close up shot of the top of the 8pin chip on the lower right on the top of the board. That is the chip that makes everything spark at the right time. I think circuit wise it may be different but should function the same.. I'd clean up the grease mess, put about 6mm dab under the power chip , put a nylon screw and nut just to be safe and try it out

 

[Team Junk]

Currently under test at a Gonzo facility.

 

[LanzSilva]

Interestingly it differs inside compared to the one 2M sliced open for me.
Lanz
Can you get a close up shot of the top of the 8pin chip on the lower right on the top of the board. That is the chip that makes everything spark at the right time. I think circuit wise it may be different but should function the same.. I'd clean up the grease mess, put about 6mm dab under the power chip , put a nylon screw and nut just to be safe and try it out

As soon as I have a little time I will take the photograph.
I did not continue with the testing process since the pulse coil hits the cover, I will have to think of something. Now I understand why the HHB system has a tab outside the flywheel.

 

[LanzSilva]

Interestingly it differs inside compared to the one 2M sliced open for me.
Lanz
Can you get a close up shot of the top of the 8pin chip on the lower right on the top of the board. That is the chip that makes everything spark at the right time. I think circuit wise it may be different but should function the same.. I'd clean up the grease mess, put about 6mm dab under the power chip , put a nylon screw and nut just to be safe and try it out

 

[Team Junk]

2m came for a visit today. Worked out nicely as I was headed out to the Barn to try and get the HEI module to fire with the wingnut. After getting enough battery voltage on my test stand. Voila we were able to make sparks with the wing nut. Think this might work.

 

[Team Junk]

chevy hei (thanks @mrrigs. ) $10.00 smily people
80's mopar v8 pickup (thanks @kopcicle @DogBunny $12. 00 rock auto
non stainless wingnut. $1. 00
6mm nut and washer

 

[Team Junk]

As a bonus the cover fits.
Going to grab a 6mm wing nut and a 9 volt battery for for the tach tomorrow so will have a better grasp on the concept soon.

 

[Team Junk]

The Gonzo Cordova edition rides again.

Did a mockup to see somewhat where stuff fit in the scheme of things .

This is a TCI motor so it's missing points plate and everything attached to it, points cam , advance rod , advance shaft bushings and the advance mech.

Will have to do some scrounging and fab work.

Having 2 pickups on the TCI engine could lead to some experiments with Bosch FI air pressure sensors and a relay to switch to a more advanced pickup on the cam when the vacuum is hi . I wonder


A points bike conversion I hope will be easier.
The only fabrication required is to shape the Mopar points plate to fit where the Yamaha points plate sat with HF grinder.

pull
points plate .
points cam

For a stock look repurpose the stock points wires to the HEI - pickup wiring.

install pickup plate using Yamaha timing plate screws .

Install wingnut on advance rod. Note still working on this part.

Set timing.