Are these modification to this flywheel? Came off a 250R 2 stroke engine. So, the rusty bottom flywheel is on the motor, the one on top has a bunch of dents in it (came out of the extra parts bin): Is this pickup shaved down on purpose? Timing? The top one is squared off. Also, the bottom flywheel on the engine has 6 holes drilled in it: The top spare flywheel has only 2 holes, and in a complete different place on the wheel: ^ Possibly some sort of balancing method or?