June 3, 1960
Bulletin #SB-785
SUBJECT: CHAMPION SPARK PLUGS
The Champion Spark Plug Company has recently developed a new version of the
J4J Spark Plug. Testing has shown that in our engines this new spark plug is
far superior to the earlier J4J and J4JM spark plugs. Based on this fact, the
earlier version of the J4J and J4JM spark plugs is no longer recommended for
our engines. The engines equipped with Champion Spark Plugs currently being
shipped from the factory are using this new improved spark plugs.
Since the designation of the new spark plug remains the same as the earlier one,
a code mark is used to identify these plugs. This code is a "star" after the J4J
designation on the outside of the box of ten spark plugs, but not on the individual
package. These "star" identified spark plugs are the only ones to be used where
J4J or J4JM spark plugs are recommended for our engines. They are available from
your supplier at the present time and have been in the field for several weeks.
JOHNSON MOTORS
W. W. DeWees
Service Department
WWD:eb
NOTE: This bulletin cancels all previous bulletins on the Champion J4J and
J4JM spark plug only.
POST ON YOUR MISCELLANEOUS INDEX.
W. W. DeWees