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Yes they should be ultrasonic cleaned. There are many people who build carbs and sell jet kits. Ask educated questions of your builder and he should be asking you specific questions as well to get your carbs dialed in.I build carbs for people all over the world and have the most comprehensive inventory of Mikuni in the world as well.If you are interested shoot me an email or give me a call.Randy - RPMRandy@rpmracingca.com