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Hello, Jason here, whom am I speaking with?
Can I get the serial number on the engine please.
I'm sending a picture back to you. That brass part is what is called a tamper proof cap. What you want to do is remove the carb, bring it to a work bench. Very carefully and very slowly drill a small hole in the center of that cap. After that, screw in a course drywall type screw. Grab the end of the screw with a pair of vice grips, and pull the tamper proof cap off. Under the cap is the idle mixture screw. On a side note, if you tried to clean the carb you will have to do so again, as you will have to clean out the idle passageway that is behind the screw.
The outlet on the top of the carb is just a vent, that can stay open.
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Its not supposed to be. Its supposed to be a simple tamper proof cap. When you drilled into it. Could you feel the bit pop through and enter a small void?
ALL you have to do is yank it out with either a hook tool, or how I do it is thread in a drywall screw and then grab that with a pair of pliers and pull.