1970-1973 Ski-Doo Snowmobiles Technical Data Manual, Page 58Get this manual
1971 DOUBLE CYLINDER ELECTRICAL START
Nordic 399E, 640E Valmont 399ER, 640ER Olympique 399E Alpine 399ER, 640ER
YLI RD RECTIFIER
MAGNETO
GENERATOR
YLI RD SPARK PLUG
RD LIGHT SWITCH
SPARK PLUG
r:tIGNITION COIL