Simple trick to clear a plugged jet... sometimes it works, sometimes it doesn't. remove the entire air cleaner assembly. get the engine reved up as much as you can, then cover the carb as opening as tightly as you can with the palm of your hand. this will creat a high level of vacuum in the carb, and CAN pull the debris through the port that it is clogging. Engine will flood and sputter try to get your hand off before it completly dies so you don't have to restart it multiple times. takes a bit of practice. I usually do this 4-5 times... if it isn't better by then,this method won't fix it.
also, verify that it is running on both cylinders. is the exhaust hot just beside the head on both cylinders after running for a short time? Most v-twins will run ok at no load on 1 cylinder, but be awful under load
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