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I wonder how many people bother to have the clutch cover and flywheel balanced before installing. Flywheels are usually balanced well but as an assembly with the cover they can be off by a lot. They need to be balanced together. Perhaps changing the stock balanced rotating assembly with some unbalanced parts induces some need for the compliance inherent in the stock pulley. The stock pulley is a harmonic balancer which is not required by the engine according to oem engineers.
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