whirling noise on the right side of motor

i got my bike back together a while a go then hit the dirt , now back at it , works great , millenium tech did a great job at replating cylinder i think it was 250 $ , i did lose my stator after words thought it was the fuel pump, some how prior to tearing down the motor a piece of metal thinking adowel spacer fell in either at the factory or when i re shimmed the first time(but there are none missing when tore it down to check internal working) any way , it now was a strange whirling noise on the right side of the motor , notice it more when you rev up then let off on the gas , any ideas ?

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