When racing sports cars in the 70's I opened the exhaust meaning I
could put more gas through the dual carbs so rejetted them than tried to balance them. Couldn't get the tach to stop swinging 500 rpm each way! It was then I realized the word carburator and computer come from the same latin word that means, if it ain't broke, don't mess with it. So I just changed to the dark background, much easier on the eyes.