1984 Ski-Doo Shop Manual, Page 293Get this manual
SECTION 04 ELECTRICAL SYSTEM SUB-SECTION 03 (SPARK PLUGS)
NIPPONDENSO (NO) SPARK PLUG TYPE
Safari 377E, Safari 447, Safari Grand Luxe
SPARK PLUG NUMBERING SYSTEM
The new Bombardier Safari models use Nippondenso spark plug type Th heat range identification High number Low number
1984 CROSS REFERENCE CHART
List of Nippondenso spark plugs used on 1984 Bombardier snowmobilesW 24 ESR-U
is: cold plug hot plug
The sales symbol is composed of "Heat Range" number, together with prefix and suffix letters, to indicate major features of the plug design Each letter has definite meaning
!wIDE GAP
9: 10: 11: 13: 15: 0.9 1.0 1.1 1.3 1.5 mm mm mm mm mm (.035") (.040") (.044") (.050") (.060")
THREAD AND HEX Letter
M MA WA SF
Thread Size