I'm now able to lighten flywheels with external crank trigger pick-ups using a rotary table setup. This allows me to remove the material between trigger points and make the flywheels even lighter. The Kawasaki 750 & 800 flywheels will weigh approximately 3.8-lbs and the Yamaha 760 & 800 will weigh around 3.6-lbs using this new technique which is almost a pound lighter than the stock flywheel. Also if you don't mind deleting the charging system, the magnets can be removed for 40 bucks more and it will remove another pound.