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I know a common mod to ducati's is to get a ligther flywheel and this is also common on dirt bikes, why with 4 stroke liter bikes and 600's is this an uncommon occurance?
 

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The 4 cylinder motor's weights are on the crankshaft. It is a common thing to do if you are willing to remove the crank. There are companies who will lighten the crank by grinding the weights. The lighter the crank the faster it will rev. The Ducati has an external (steel) flywheel which can be replaced with a lighter (aluminum) one pretty easily.
 

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I just took out the crankshaft. The bike revs like crazy fast now.. sweet

Wait a minute.. it won't move when I put it in first.. hmmm
 
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