Adjusting the Choke on a MerCruiser
To increase the gas entering your MerCruiser cylinders, you’ll need to adjust the engine’s choke. The choke enriches the air and gas mixture that enters the cylinders, thus making starting a MerCruiser engine an easier task. Of course, before you begin, you should check to make sure that your boat has plenty of gas and Evinrude 2 cycle oil XD100.
First, tilt the motor so the drive system is submerged and then open the tank vent. Shift into neutral and set the choke lever between full and half full. Place the throttle in the start position and rip the manual cord (or press the start button on an electric starter). Adjust the choke back into the off position as the engine warms.