1984 Ski-Doo Shop Manual, Page 292Get this manual
SECTION 04 ELECTRICAL SYSTEM
SUB-SECTION 03 (SPARK PLUGS)
Design symbols used in NGK spark plugs'
-PREFIX-SUFFIX-
-WIDE GAP-
Heat rating numbers4
10: 11: 13: 14: 15: 20:
1.0 11 1.3 1.4 1.5 2.0
mm mm mm mm mm mm
(.040") (.044") (.050") (.055") (.060") (.080")
Construction
18 mm 14 mm 10 mm