Yellow Mode- Mid-throttle and Mid-RPM range

Yellow Mode numbers near 1-3 are shown on the top, and lean with air/fuel mixture near 14:1 or 15:1
Yellow Mode numbers near 4-6 are shown in the middle, near the preferred 12:1 to 13:1 air/fuel mixture
Higher value Yellow Mode numbers near 7-8 are shown on the bottom, with rich air/fuel mixture