Hello Bestseller,
Just wondering if you used a flywheel puller or a hammer and screw drivers to remove the flywheel ? A hammer could have bent the end of the crank enough to cause this problem, you could try moving the pulley around until it sticks and then tap it with a piece of wood and a hammer back the opposite way. See if this resolves the problem.
Pictures will help a lot, I would pull the flywheel again before anything else to see that nothing has become dislodged or is loose. Doesn't take much in the way of dirt etc to cause a grinding issue.
