carbon in intake ports

I have two out of 3 intake ports that are black. Is this an indication of leaky valve seats or valve seals?

updated with photo.

wr400intake.jpeg

a small amount of seat leakage can cause that, if it runs good and the valve clearances are staying good i wouldn't  worry too much.   

Okay, thanks for the response.

I changed my valve seats around 6 months ago, and now my head has no deposit at all. But I wouldn't be too worried. Did you ever open up you head lately? Valve seals only costed me like 50$ or something like that at my dealer, for all five.

I've owned the bike for 3 years and haven't had the head off. It runs fine, but it is 15 years old. Did the seats or seals run you 50?

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