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More than 14lbs, judging from other comments. However, it's not the weight of the flywheel that's important nearly so much as where the weight is.
A 12" diameter flywheel that weighs 15lbs and has most of the weight out on the rim will have a far greater effect than a 12" diameter, 15lb flywheel with most of the weight near the hub. Reduce the diameter to 6" (equal weight), and you're way ahead of the game even if the weight is out on the rim.
So, just knowing the raw weight doesn't tell you much. It would be possible to reduce the weight by a very significant amount and have virtually no effect on the rotational inertia of the flywheel at all.
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