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Yep, the main jet in the center is visibly clogged, the best way to remove it is to first slide the pin that is holding the white plastic float out, and carefully lift the float straight up. If it resists, the float needle underneath may be stuck in the seat. If the float and needle come out, carefully set them down so the needle doesn't slide off the tang of the float. Then use an 8mm (usually) box wrench to undo the hex portion under the main jet and thread that out. The next step is to use a small straightslot to remove the pilot jet, which is to the right of the main jet in your pic. Once you have removed both of them, you now have to clean them, not an easy task, as it looks pretty crusty on the main jet. Soaking the jets in carb or contact cleaner is a start, and may take a while. Ideally, the jets will have size numbers on them, but not likely. Some people poke a very small guitar string or piece of wire brush wire to clear the jets, I'm not a big fan of doing that.
The bottom part of the main jet is called the emulsion tube, and you'll see some holes drilled into the sides of that, sometimes they get clogged and need to be cleaned also. Once you clean the face of the main jet, you can separate it from the emulsion tube with a straightslot, to clean it better.
Spraying carb or contact cleaner in all the openings of the carb body, followed with blowing them out with compressed air may clear them out. The best solution would be removing the air/fuel screw and idle screw and having the carb and all parts cleaned in an ultrasonic dip tank. Short of that, maybe you'll get lucky and be able to get it to work for you.
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