Idle mixture adjustment - Johnson

[billaranguren@yahoo.com]

I have a 99 200HP Johnson with a not very different problem. Sneezes and stalls when warm at idle. Symptoms indicate I should adjust the Carb Idle mixture, based on the service manual. <br />That manual shows a picture of a flatblade screw head for making the adjustment. When I look in the recess where this screw is supposed to be, there is some odd looking interface. I cannot tell if: 1/ a special tool is needed, 2/ There is no adjustment and this is a permanent plug where one once there was an adjustment screw. <br /><br />HELP - the manual lies!