I've got a lightened flywheel (that no one has bought yet).
I remember when I checked, it was 4lbs lighter but thats with bathroom scales which isnt the best way to measure the difference.
You notice the engine is more responsive at idle but it doesnt make a huge difference when driving.
Thay flywheel is pretty expensive and such an item is really only beneficial on something with a fully balanced, knife edged bottom end assembly.
A lightened flywheel doesnt reduce the torque at idle (as most like to believe) it actually reduces its inertia. So if you are clumsy with the clutch you lose the inertia quickly. Its a way of storing energy.
I would only be concerned when using a tight arsed bastard paddle clutch with a light flywheel as you are much more likely to kill the little inertia the flywheel has.
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