lamb_daiquiri brings up a good point about balancing. Notice on the flywheel pics, for balancing there are several small drilled holes opposite the missing tooth. A similar thing can be done for the crank trigger wheel, but then again being much smaller it may not matter enough. I didn't balance my mine but it used a factory trigger ring (Escort) which may have had a balance built into it. In any case balancing will be easy for a shop set up for this type of balancing.