exhaust problem?

I found the exhaust of my 87 Volvo becomes black, what kind of problem does this suggest?

Thank you!

Reply to
Zhang
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Your engine is running way too over-rich.

Cheers, Peter.

Reply to
Peter Milnes

Mine also does this, how to you adjust it? I remember something to do with the carb but not what (been years since I played with one)

Reply to
Dale Albiston

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