1979 Ski-Doo Supplementary Shop Manual, Page 216Get this manual
SECTION 08 SUB-SECTION 05-02
1979 BOSCH SPARK PLUG CHART
ENGINE TYPE ELANSPIRIT ELAN CITATIONMIRAGE OL YMPIQUNUVIK EVEREST FUTURA EVERESTFUTURA EVERESTFUTURA BLIZZARD 5500 GP Special 250 250 DL 300 340 340 400 440 444 LC 503
FULL LOAD
PARTIAL LOAD
247 248 294 343 343 402 440 444 503 354 354 454 640