You would need to be a good machinist to lighten a flywheel. All it does is let the engine rev quicker. It shouldnt cost very much to have it done. You should only take a few ounces off of the flywheel. Advance you timing 4 degrees. You can do this by buying a degree key from vitos. I prefer an adjustable timing plate. I run a Ricky Stator stator with adjustable timing plate.