So I recently had a magneto overhauled and replaced along with the 4 plugs to this magneto. The aircraft is a Piper Cherokee. I’ve noticed since having this replaced some black exhaust can be seen on the nose wheel, especially if the plane is leaned out during flight. The EGT is running at 200 degrees or so while in cruise and not leaned out. It seems the more it’s leaned out the more black soot and higher egt now. Not sure of this new magneto is the cause or if it’s something else, again.