Bombardier SeaDoo 1998 factory shop manual, Page 228Get this manual
Section 08 ELECTRICAL SYSTEM Subsection 02 (IGNITION SYSTEM)
NGK Spark Plug Symbol Explanation
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
18 mm 14 mm 10 mm 12 mm mm 12 mm 19 mm Reach
19 mm (34") Taper Seat 12.7 mm (12") 11.2 mm (716") 21 mm (5354")
A: B: C: G: GV: L: S: V: X: Y:
Special Design Single Ground Special Alloy Dual Ground Special Alloy Racing Type Racing Version of V-Type Half Heat Range Standard Center Electrode Fine Wire Center Electrode Booster Gap V-Grooved Center Electrode