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I am concerned about my 175mm oversized crank pulley on 4a-gze. It is a Cusco pulley copy which is CNC machined. On low revs you can see it wobbling - on higher revs it is not visible however I am aftraid that it will wear out my crank.

I recorded it and here it is: YouTube - 4a-gze oversize 175mm crank pulley vibrations

Can somebody confirm that other oversized pulleys are perfectly balanced and do not behave this way...
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