I have just finished up restoring another U.S. B and have a carb issue. I have disassembled the carb twice to make sure it is clean,cleaned all passages with drills. soaked, sprayed, new gaskets, new float, set float level, new needle valve and seat, ect... This thing is spotless inside and out but it seems like I cannot get it adjusted to where it is not loading the engine and running to rich. If I try to lean it out using the mixture srews It will get where drops the rpms to much and runs worse. It just seems like it goes from to rich to too lean with no "sweet spot" in between. Any Ideas? Dave
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