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OEM YZ400 flywheel heavier than 02 YZ426 FW?

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Yeah, yeah, I'm a cheapskate...I am looking for a slight increase in flywheel inertia for my 02 YZ426. If memory serves, aren't the 98-99 YZ400 flywheels heavier than the 426 models? Any guess on how much difference?

Thanks in advance.

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