Mystery rich condition

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kawagumby
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Mystery rich condition

Post by kawagumby »

The block box was the culprit!

I recenlty picked up a low-time 2001 KDX220 - ran really rich off of idle through mid, kinda seemed like a needle problem or a cork up it's arse. The previous owner had stuck a humongous needle in it to compensate - but no matter how lean the jets, it seemed like the plug was always wet after shut down and at mid-throttle it would never run clear. Jetting did help tho' which kinda faked me out some.

After the usual routine, checking for exhaust restriction, air way obstruction, wiring, etc...I swapped out the black box...and it ran perfectly.

Just something to file under troubleshooting "could be's".
1994 KDX200, Beta 200rr, yz125, yz250, kx100 modded for adult, gasgas contact 250.
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Velocity_Stack
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Post by Velocity_Stack »

Please elaborate on the black box, us new comers need to know what black box you speak of.
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SS109
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Post by SS109 »

He is talking about the CDI box which is your ignition system.
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Current KDX: '98 KDX220
Old KDX: '90 KDX200 -White/Blue
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