Hope this is the correct forum... There is something that I still can't figure out. I've tried searching every where but to no avail... I understand why a light weight flywheel is good/better but what I haven't gotten the answer to is why changing over to a lighter crank pulley is bad. I figure they are doing the same thing. I'm sure changing the size if the pulley itself might cause some damage but i don't see how it can cause damage just if it's lighter... am I missing something here?