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I have never seen or heard of a ribbed flywheel before. Are these circular ribs? If so it is a damaged face and needs machining. Straight ribs radiating out from the centre would strip the clutch material as you "slip it" for a controlled takeoff.
As you have not re-installed the clutch plate that came with it, there may be some interferance around the central damping spigot area of the clutch plate or possibly it is arse about and hitting flywheel bolt heads.
Either way it needs to be checked and remedied quickly as bad vibration back through your crank and gearbox can lead to major damage
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