Think about the condensation when the exhaust cools. Then that water gets pushed out when you fire up the engine and it picks up the loose carbon particles along the pipe as it exits. Once the exhaust is warm, it becomes vaporized and is spread out in the atmosphere.
Cordoba black carbon from exhaust on driveway
My '75 Cordoba leaves a tiny amount of black carbon on the driveway when the engine is started cold. My carburetor is not running rich either and the idle is fine. Should I replace the original muffler?
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