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Looking for a CDI box for 2000 Big Bear 400

QuadMan49

By QuadMan49
in Yamaha ATV Forum

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QuadMan49 Apprentice

QuadMan49

Posted
Posted (edited)

Hello,

Long story short, I accidentally fried my quad's CDI box.

I found several OEM ones for $300 which are out of my price range. Does any one know where to find one for less? Or any way to modify a $20 Chinese CDI to make it work? Thanks.

Edited by QuadMan49
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  • QuadMan49 changed the title to Looking for a CDI box for 2000 Big Bear 400
Mech Mentor

Mech

Posted
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I think your yamaha cdi  will have a lot more wires than most cheap aftermarket cdi..  Yamaha are pretty particular about having their special cdi, and we've been puzzling over them in here for quite a while..  It's really hard to identify models and which wiring they have..

If you start looking in manuals and comparing your wiring to what's shown you might have trouble finding a match..

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Mech Mentor

Mech

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Don't know mate, but I know Yamaha cdi, wiring, wiring colours, and switchgear come in about a zillion different flavors.. They are not as easy as most jap makes to figure or adapt parts to.

It would be a good idea I think to research what exact model and year and market you have before spending $300 or trying to buy a vauge as aftermarket.. The aftermarket guys will sell you anything..

Download all the 400 manuals you find in this site and compare their wiring diagram colours to your bike, then compare the plug shape and  pin positions they show compared to what you have.. 

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Gwbarm Proficient

Gwbarm

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Im kind of in the same boat, pay more for CDI than I paid for the whole bike when I don't know how good the engine is, but, im certainly not going to pay 300 used taking someones words that it is good, there's not even a test for that, how does he know its good, and even if it is good , for how long. I have been dragging my feet on this one, but I think im going to have to buy a new one for 400. If you come up with another option, please let me know.

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QuadMan49 Apprentice

QuadMan49

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Posted (edited)
1 hour ago, Mech said:

Don't know mate, but I know Yamaha cdi, wiring, wiring colours, and switchgear come in about a zillion different flavors.. They are not as easy as most jap makes to figure or adapt parts to.

It would be a good idea I think to research what exact model and year and market you have before spending $300 or trying to buy a vauge as aftermarket.. The aftermarket guys will sell you anything..

Download all the 400 manuals you find in this site and compare their wiring diagram colours to your bike, then compare the plug shape and  pin positions they show compared to what you have.. 

To clarify, I bought my quad a year ago in excellent running condition. About a month ago the 4-wheeler bogged down while riding, I quickly discovered the positive battery terminal snapped off while riding. As soon as I put it back on temporarily, there was a spark and the quad would not run anymore. I looked at the CDI and several capacitors were popped out.

I tried a $25 aftermarket CDI, and not surprisingly it wouldn't even turn over. With the original CDI it would turn the motor .

Edited by QuadMan49
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Gwbarm Proficient

Gwbarm

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I did see on one of my searches a company tests CDI and repairs if needed, I didn't pay it much attention because it was 250 to repair and 50 to test to see if it needed repair, at that point I was still toying with the idea of building one from Chinese parts, but the 2000 Big Bear is a DC CDI and a little more complicated, and most Chinese stuff that I thought might work was AC. They do make a CDI for Kodiak 400 same year, aftermarket for about 30.00 but the plugs are different from the big bear, but the Kodiak and Bears seem to be wired about the same so I don't know what the difference is, and nobody has been able to tell me. Not much help, but that is what I have found out in my limited research.

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Gwbarm Proficient

Gwbarm

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Just reading your post, must have come in while I was writing my last one. I never even found an aftermarket version that claimed it would would work with the 2000 Big Bear. I think 2000 and 2001 were different somehow.

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Mech Mentor

Mech

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All those cdi need to know when the electric start is being used, and they do it in two different ways. Some they feed in a 12v  signal by banching off the wire from the start button, and in others they run the power for the start button through the cdi and it gets earthed by the start button..

You Quadman, need the second type.. That also narrows down the number of wiring diagrams that are going to be on your bike...  There are other differences in cdi and wiring too..  even withing that second type..

If you can see the circuit board Quad, you might fix it by soldering in a few new capacitors.. You'd want to check for anything overheated looking, dry solder joints, cracks in the board.. But those capacitors that leak are enough to be the whole and only fault.  They used to be common years ago and were always being replaced. Capacitors are a few cents each.

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Mech Mentor

Mech

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Oh I think you'll be lucky fixing that one..  I thought it must have been an exposed board..  Those are real hard to get clean enough to identify the components, and it's real easy to do damage. The professionals might have some solvent for cleaning them ?

 

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Mech Mentor

Mech

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The board will be sprayed with a varnish which is basically nail polish....  If you do happen to use something that damages/removes that layer you can get clear nail polish from the chemist..  That's what I've always used to seal repaired boards..

After the repair you need to seal the board, it prevents parasitic leaks, and it stops the copper corroding..

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mga Enthusiast

mga

Posted
Posted

i found a few people on facebook selling parts from yamaha big bears. I'm in kentucky, and i've bought a few parts from a person who will ship and accepts paypal. They're parting out a 400 kodiak and very reasonable too.

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Gwbarm Proficient

Gwbarm

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Iv wondered that too, the generic ones I have seen say it fits the Kodiak and Warrior but not the big bear, and if you read the ratings , many complaints about it not even working with the Kodiak. 

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Mech Mentor

Mech

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Yamaha electrics are diabolical..haha..  Their manuals are just as bad.. I've got a heap of them and in a single year and model they say the same manual does big bear and kodiak, and others says they don't, they wiring diagrams disagree with one other, and in forums with people comparing the bikes to the diagrams it seems there are a heap of differences and everyone seem to have trouble being sure what they have..  I've been trying to sort this problem out and get to the bottom of it for literally years..  The best I can advise is.. buy genuine !!

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Gwbarm Proficient

Gwbarm

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I have come to the same conclusion, I haven't even got to the CDI box yet, I am on my 3 rd aftermarket coil, and not one of them has the correct resistance rating that the manual says the coil should have, so if im having this much trouble with generic coils I can't imagine a CDI being correct either, they are specific to the bike, and there is something different about the 2000 and 2001  models I haven't figured it out yet but im working on it. As much as it hurts, im buying OEM parts from now on. The coil may work fine once I figure out why im not getting spark, but they don't has the specs the manual says they should have.

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