RED-4 ZEXEL electronic controlled in-line fuel injection ... it can adjust the throttle up and down through the arrow ↑ ↓. Close the RED4 POWER switch, oil pump power ... off. Press Select button, indicator lamp light, and press arrow ↑ ↓ to choose pre-set rank, and press select ... Limp home, controller output value will be 5%. RED-4 ZEXEL electronic controlled in-line fuel injection pump electronic ...