Originally Posted by jbrow1

You would then tune the low speed needle to get the takeoff and idle setting you desire. Say if the engine is all warmed up and then you let it sit in one spot for ten seconds or so and then nail it. You want a nice crisp out of the hole start and smooth transition into the full throttle range. No stumbling or gurgling at the initial throttle input, and again none as it goes from the low id to full throttle revs.

The pinch test is mainly used when somebody has an engine that won't tune. They do the pinch test as a quick reference to see if their low speed is way out of whack.

But you're always better off being a bit rich than a bit lean. Engines last much much longer when run a little fat.