I'm trying to understand a little better about the X-cal 2. I notice that there is a "global spark" adjustment. What's the difference between global spark and adjusting the timing between any given rpm range? I can add or subtract timing between 0-2000, 2000-4000, and 4000 to 6000 rpms. I can also adjust the global spark. What role does this play in overall timing. Just curious. Pearl02.
