Fuel-Pack FI2000 Cobra 06 SoftailCaracteristicas: Three easily identifiable lights: green Fi2000R is adding more fuel to the air fuel ratio approx. 14: 1; green and yellow lights these lights will be on in unison when throttle is open more quickly and air fuel mixture is approx. 12. 5: 1; red light comes on and stays on as long as the Fi2000R follows the fuel curve while adjusting to approx. 12. 8: 1 air fuel ratio, which is where the engine will produce its best full throttle power