2001 Ski-Doo Factory Shop Manual Volume One, Page 238Get this manual
Section 06 ELECTRICAL Subsection 03 (SPARK PLUGS)
DESIGN SYMBOLS USED IN NGK SPARK PLUGS
PREFIX SUFFIX WIDE GAP
10: 1.0 mm (.040") 11: 1.1 mm (.044") 13: 1.3 mm (.050") 14: 1.4 mm (.055") 15: 1.5 mm (.060") 20: 2.0 mm (.080")
Thread diameter Heat rating numbers
Firing end construction
A: 18 mm B: 14 mm C: 10 mm D: 12 mm E: mm J: 12 mm 19 mm Reach
Construction
E: 19 mm (34") F: Taper Seat H: 12.7mm (12") L: 11.2 mm (716") Z: 21 mm (5354")
A: Special Design B: Single Ground Special Alloy C: Dual Ground Special Alloy G: Racing Type GV: Racing Version of V-Type L: Half Heat Range S: Standard Center Electrode V: Fine Wire Center Electrode X: Booster Gap Y: V-Grooved Center Electrode