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About the big knob–To start a cold motor, turn it all the way to the left which holds the float pin down, flooding the carburetor. That provides an extra gulp of fuel (instead of a choke). The book will tell you a number of seconds to hold it. I just hold it till it drips gas, then turn the knob to the right to release the float pin. It should start right up. Once running (on a boat on the lake), move throttle to wide open position and adjust the big knob to where it runs the best. At this setting, the knob should be pointing more or less straight up. If it isn’t, you can loosen the screw in the center and reposition the knob so it points up, then tighten the screw. You can fine tune the idle screw on the side for best slow idle if you wish. Most people don’t even know it is there.