1985 KDX200 magneto and cylinder

Discussion specific to the various air-cooled KDX models sold in the USA
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85' kid
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1985 KDX200 magneto and cylinder

Post by 85' kid » 03:18 pm Apr 29 2021

Hi all, I have a 1985KDX200. Recently the crank seals went out on it, so I thought I might not need to split the case. So one crank seal is on the magneto side, so I pulled the magneto off and a magnet was broken in half. That was narly I had never seen that before, it was obviously my fault but I was surprised to see exposed magnets with nothing around it. Now I have been looking around for a 85' magneto, but cant find one. But I have bee able to find some 90's KDX200 magnetos. Would that work? if so could I use the same stator? Also the top end is crispy, there is scarring AND pitting. So I was looking for places to do it and no one would do it because of the nikasil coding, I guess California doesn't allow or something. So any suggestions and answer's would be great. Thanks

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Re: 1985 KDX200 magneto and cylinder

Post by KDXGarage » 03:26 pm Apr 29 2021

Welcome to kdxrider.net.

https://www.ebay.com/itm/233586627633?h ... Sw2FVbPM38

PowerSeal USA or Millenium Technologies to replate the cylinder. Wossner piston and rings have been suggested by some as a safe OEM replacement.
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85' kid
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Re: 1985 KDX200 magneto and cylinder

Post by 85' kid » 03:46 pm Apr 29 2021

Ok thankyou. I saw that you provided a website for the magnets, but could I just buy a 90's magneto ?

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Re: 1985 KDX200 magneto and cylinder

Post by KDXGarage » 09:18 pm Apr 29 2021

I am not sure. You might want to call Jeff Fredette and ask him if he sells a solution. frpoffroad.com
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Re: 1985 KDX200 magneto and cylinder

Post by 85' kid » 11:01 pm Apr 29 2021

Great thanks, ill give him a call tomorrow

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Re: 1985 KDX200 magneto and cylinder

Post by KDXGarage » 11:10 pm Apr 29 2021

I know that with a modified stator plate, one can run a 1995 + KDX stator on a 1986 - 1988, but I don't know about the 1985 and earlier. That's before my time for big bikes. I was on a 1985 KDX80 at the time. :-)
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Re: 1985 KDX200 magneto and cylinder

Post by 85' kid » 03:14 pm Apr 30 2021

Yea I think the only difference from the 85 to the 86 was the powervalve, engine wise. When you say modified are you talking trimming the stator or also buying a 90's stator?

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Re: 1985 KDX200 magneto and cylinder

Post by KDXGarage » 03:19 pm Apr 30 2021

There are several more differences between the 183 - 1985 engines and 1986 - 1988 engines. Search on here for a few threads where other people have done it, then shown pictures and their story on how it went.
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