98 KDX 200 lost compression

Discussion specific to the 1995 - 2006 KDX200 (H Series) and 1995 - 2005 KDX220R (A Series) models sold in the USA
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KDXGarage
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Re: 98 KDX 200 lost compression

Post by KDXGarage »

How many minutes is on that plug?? No color does not look good.
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JakerB
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Re: 98 KDX 200 lost compression

Post by JakerB »

Well, it just blew up again. Not sure what exactly happened but I’ll pull it apart and try and find out this week.

No, there wasn’t a whole lot of time on the plug.
John_S
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Re: 98 KDX 200 lost compression

Post by John_S »

Sorry to hear it blew again. If you can, do a leak down test before you tear it back apart. You likely will know why it blew up from that. The jetting you were running shouldn't be so dangerously lean. I'm thinking it had a good size air leak and if you find it now you can double check the same area with another leak down when it goes back together.
JakerB
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Re: 98 KDX 200 lost compression

Post by JakerB »

Yeah after blowing a second time I’m afraid that it’s got a decent leak.
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bufftester
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Re: 98 KDX 200 lost compression

Post by bufftester »

Yes, likely you have a blown left crankseal. Anytime you do a compression check or suspect engine issues you should also do a leakdown (on 2Ts) check as it is a better indicator of engine health than just compression alone.
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