1969 Evinrude 40 HP Big Twin, Big Twin Electric Lark Service Manual 4596, Page 27Get this manual
NOTE DO NOT attempt to check the operation of an automatic choke unless the motor has cooled to room temperature (70)Operation of the choke during starting and warming-up cycles cannot be tested accurately on warm motorUsually motor temperature will be normalized sufficiently if the motor has been allowed to stand for period of one hour with the cover off or two hours with the cover on Figure 3-19Throttle Cam Adjustment eLoosen center screwDO NOT disturb position of needlePosition knob so that it is pointing straight up and push back to original position on needle, leaving enough clearance so that knob will turn without bindingTighten center screw to secure knobfAdjust idle adjustment screw so motor will idle at 650 rpm IN GEAR
Figure 3- 21Adjusting Automatic Choke
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