made

I brought a second hand 125cc Bigfoot and the guy said it wasn't running because of something electrical so I tried to kick it over and it made this terrible noise so I took off the magneto cover, seemed fine then I tried to kick it over once more and the magneto fell straight off.

As title states, looking for a reputable mechanic/engine shop to rebuild a z50 motor back to being as reliable as the factory made it, with maybe a sniff of performance (as who can really stand to tear something apart and rebuild it without improving it...) Chasing rock solid reliability, and...