Spark Plugs - BOMBARDIER 1980 Shop Manual

SPARK PLUG NUMBERING SYSTEM
Bosch has introduced a new numbering code for its
complete line of spark plugs. The new code is shorter,
therefore easier to use. The following charts will assist
you in making the change-over easily and effectively.
IMPORTANT: The new code has a different heat range
identification system.
High number • hot plug
Low number • cold plug
SECTION 04
SUB-SECTION 06 (SPARK PLUGS)
SPARK PLUGS
1980 CROSS REFERENCE CHART
List of Bosch' spark plugs used on Bombardier snowmobi-
les:
NEW NUMBER
M4A2
M7A
W3C
W2C
OLD NUMBER
M240T1
M 175T1
W275T2
W300T2
(SPARK PLUGS), PAGE 1