Finally got my blaster together this past weekend and have been breaking it in and tuning it. With the ski off when I adjust the B pipe screw or carb adjustment screws, I get a gnawing/biting(insect) like feeling on my fingers. Particularly where I have open cuts. Could the start stop leads cause this? All the other wires are new except those. It also seems to do this about half the time I'm under the hood.