black side panel from exhaust?

I noticed that my exhaust was running very black around my e series pipe and staining my side panel

I thought I was running rich so I dropped one size on the main,and pilot jet and one clip up on the needle. But still very black is this common?




I have been running the E-Series for a couple of years and now that my jetting is right on (thanks JD and Clark) I have NO staining.

My want to consdider some more tuning.


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