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Crank Pulley which is also called a harmonic dampner is perfectly balanced for the crank as well as has weight to help keep the engine rotating same with the flywheel. Remove these weights and the crank will have lack of centrifugal force and momentum to keep it spinning in rotation. Without this momentum, the crank will twist because the pistons and rods cause a little counter rotation because guess what, combustion happens before top dead center. I won't get into why before top dead center, but this causes a counter rotation on the crank and ends up twisting the crank.
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 Turn and Burn! 
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