1983 Ski-Doo Shop Manual, Page 206Get this manual
SECTION 04 ELECTRICAL SUB-SECTION 03 (SPARK PLUGS)
SPARK PLUGS
NOTE: The 1983 Bombardier snowmobiles are using two (2) spark plug types One type is the Bosch spark plug and the other type is NGK spark plug
BOSCH SPARK PLUG TYPE
SPARK PLUG NUMBERING SYSTEM
Bosch has introduced new numbering code for its complete line of spark plugsThe new code is shorter, therefore easier to useThe following charts will assist you in making the change-over easily and effectivelyIMPORTANT: The new code has different heat range identification system
NGK SPARK PLUG TYPE