Does sound like vacuum leak. But I've had problems before, when I first got the YD, that the wire connections on the coil was not getting good connection. And was acting the same way. Really noticed it when you gave it more throttle.
Also, I half to keep an eye on the clamps from the carb. to the rubber intake. If not placed correctly, the bottom of carb. will slide off a little and cause a vacuum leak. But has happened enough times, I know right away when it does do that.
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