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Color of the soot in the end of the exhaust

The soot in the end of the Pantera exhausts is always black.

When I had my Sunbeam Rapier (named Alpine GT in the USA) I used to use the colour of the soot to tell if the webers needed adjusting. Black meant too rich, pale grey too lean, and a medium grey about right.

My Pantera exhausts are always black but I don't know if this means anything because I ran the Sunbeam on leaded fuel and the Pantera runs on unleaded.

So is my Pantera running too rich or does unleaded always run black?
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