How does the flywheel work?
A#8:Together with the stator, the spinning flywheel creates current for the ignition and lighting circuits. Together with the pickup coil, the flywheel tells the pickup coil where the pistons are so the CDI can fire the spark plugs. As the flywheel rotates, the pickup coil senses the location of the tabs on the oustide of the flywheel, and sends a pulse to the CDI. Another function of the flywheel is to store inertial energy; by spinning on the crankshaft the flywheel’s weight can affect how fast engine RPM rises and falls. A relatively heavy stock flywheel will keep the crankshaft spinning longer than a lightened flywheel so when you let off the throttle and then hit it again there is less “lag” between the time that the motor hits it’s “powerband” (or peak horsepower RPM) and the RPM that it was spinning when you let off the throttle…the downside of a heavy flywheel is that from a very low RPM it takes longer to hit the powerband. Conversely, a lighter than stock flywheel has less
