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took it upon himself to correct the manufacturing defects of the original 58mm Z1 throttle bodies that I was assured, Z1 had never heard of, and then suggested I should try to sand them myself. POS Z1 58mm with irregular bore shape, ill-fitting throttle plate that stuck closed.
 defective 58mm unit CNC rebored to 61mm, perfectly round, with a properly sized throttle plate

WARNING: I lack industry backing

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