Fouled spark plugs - why does it look like this?

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MildDog

Race Dog
Joined
Mar 25, 2009
Messages
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Location
Cape Town
Bike
Suzuki DR-Z 400
I had a CR 9 EK in my DRZ (440+hotcam).

It had only been in for about 3 months and it stopped working. Replaced today bike running fine.

Stock on a DRZ is CR 7. I have read that modded bikes should be run with a slightly cooler plug.
So now I have a CR8 in. 9 may have been too cool?

What makes a plug look like this?

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