1980 Ski-Doo Shop Manual, Page 23Get this manual
SECTION 02 SUB-SECTION (04-06)
1980 BOSCH SPARK PLUG CHART
ENGINE TYPE ELANSPIRIT 250 CITATION 3500, MIRAGE CITATION 4500E, MIRAGE IIIE CITATION SS, MIRAGE SPECIAL EVEREST 500E, FUTURA 500E FUTURA EVEREST LCFUTURA LC BLIZZARD 5500GP SPECIAL BLIZZARD 7500SUPER SONIC BLIZZARD 9500ULTRA SONIC ALPINE 640 ER ELITE 450 LC