Dylan, I experienced the same issue. With JB4 installed I would experience the issues with squealing. I was FBO I slowly removed each piece individually until the only thing left was the JB4. I removed the JB4 and the noise is gone. Sometimes during slow speeds I think I can hear it but once I roll my Window down the noise is gone. Fastward to today, Im installing a new valve cover. Im sure it will take care of the issue. Thanks again to vespa for solving the mystery.
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