Dusterguy wrote
Go to your car, take your finger and put it in
exhaust pipe. After that look at it and see it turned black. Yes its carbon. Yes it's normal even in engine that is perfectly in good shape.
My cam shaft is large enough that i had to drill 3/32 hole in each butterfly, so that the fuel mixture screws would respond when i adjusted them.
I can go out there Right Now and there will be no black soot in the tail pipe, Light gray!
