Need help on a GSX-R400RFK (GK73A) CDI

[charisp]

Hi to all,

i own a gsx-r400rfk (GK73A). The bike has been idle for a year or so and recently i remembered the good old days we had together(missed her a lot to be honest) so i decided to get it started again.

I cleaned the carbs, bought new battery and sparks but the bike refused to start(this was one of the reasons the bike was idle for so long).

I noticed that the sparks where not firing... I had a gut feeling that there might be something wrong with the CDI so I openned the box and found that the board was damaged(no idea what might have caused it).

Here is a pic of the board

https://img216.imageshack.us/img216/7081/picture067tr2.jpg

As you see there are two components missing(circled in red).
I would be very grateful if somebody could send me a picture of the CDI(part no 32900-32C10) where these components and their ratings are clearly shown.

A circuit diagram would do the job as well.
Also if somebody has the workshop manual for this bike let me know.(I have a japanese version-not very helpful i must say)

Any tip will be much appreciated

[Ichy]

I'm struggling to understand how they are missing? The bike was running before. You opened the CDI. The CDI is designed to be waterproof. So how did the bits disappear? If the solder failed they should still of been in the box. Is it just a guess that they are missing? Some boards are designed with solder points that have no components.

There's is no way that you will get your hands on a wiring diagram for the CDI. They are supplied as black boxes to the assembly plant.

[Timmeh]

Like Itchy says, CDIs are utterly non-servicable. They either work or they don't.

You can check its function by measuring the resistance across some of the terminals; although being an imporft they're no haynes manua, and finding the figures that ain't in japanese might be difficult.

If there's no spark, it could be any number of things. I'd start first with the HT leads and trace your way back through the wiring.

It could just be a dud coil.
____________________
GSXR400 x2 | '94 RVF400 | '93 TZR125 4DL (again)
20:22:30 BLUEX5: i would love to be forced to undergo a**l plugging with different sizes
20:48:18 Temeluchus: comp you hunk of smouldering homos3x you

[Kickstart]

Hi

Think this might be needed:-

https://www.bigccracing.com/shop/product.asp?idproduct=214

All the best

Keith
____________________
Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[charisp]

The black box was not sealed as it might have been opened by the previous owner. As you see in the picture there was a fire which melt the componets(completely). There were some residues of them which i removed along with excess solder to check the board. Of course there might be other damaged components as well but i have to complete the puzzle in order to do this.

I must add here that i have some knowledge of electronics.

[Timmeh]

[charisp]

Indeed there might be a chance that the microprocessor is dead. If not i think its worth the trouble fixing it rather than spending some £150 on a CDI.

[Timmeh]

[Blau Zedong]

Buy a GSXR400J CDI if you can get one (no green and yellow wire). Probably the fastest stock 400 other than the ZXR400H.
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18:54:48 Rob Fzs: jews don't give away stuff for free

18:54:59 Rob Fzs: unless its their clothes/ hair/ golden teeth

[charisp]

Thanks for the tips guys, but before i buy the cdi (or sell the bike for spares) i will wait till something pops up.

You never know.Someone might have been there, probably has a picture like mine and willing to share

[Ichy]

[Andyco11]

[Caft Dunt]

check part no on d2, probably same as d1, replace them both. can you identify the colour codes for r9? replace it. check coil drive transistors ig 1 and 2 for short circuit using a dvm on diode test part no 2sd1976. chances are the processor is ok it should be well isolated from the drive stages. follow the traces leading to all those components and look for open circuit resistors and short circuit semiconductors. before testing check the bikes wiring for what caused the failure in the first place.
failing that i`ll swap you the bike for an O2 XDA and some merc alloys?

[charisp]

Thanks for the tip Gaf Dunt.
I also suspected that the second diode could be the same as the first one. There where,though, traces of a component positioned in the middle of the diodes which melted and destroyed the board(No idea what might that be).

The problem might have been caused by the coils. I checked them and found that the primary coil connected to the cdi was ok whereas the secondary coil was damaged. This must have overheated the cdi as electricity from the primary coil has nowhere to go

If anyone is interested for the cdi contact me on email