flywheel

My flywheel failed catastrophically today, destroyed itself, the magneto, the blower, the housing, and to top it all off, broke the engine block itself. I have heard mention of billet flywheels before but I can't seem to find one anywhere. Can someone point me to somewhere I might be able to...

I'm using a 25cc weed eater motor (poulan). After removing the plastic casing and pull start, I see the drive shaft. But there is a disc at the base of the drive shaft that spins with the shaft. It has a magnet piece that rotates by a little black box. The black box has the spark plug wire...