Everyone has their favorite guy, but in the US, Ed Strain is your man for magneto rebuilding... does them all: Splitdorf, Bosch, Lucas, etc... He does not have a website, but do a search for magneto repairs or Ed Strain, and his name will come up many times on many sites, all recommending him.
Give him a call and let him know your needs. He does great work. In 2011, his Lucas rebuilds ran $250-300.
ED STRAIN MAGNETO REPAIR 727-521-1597.
ED STRAIN
6555 44TH ST. N. #2006
PINELLAS PARK, FL 33781
TEL: (800) 266-1623
TEL: (813) 521-1597