June 28, 1961
Bulletin No. SB-854
Spark Plugs
SUBJECT: Champion's new resistor spark plug for use on...
35 & 40 h.p. engines with 378484 magneto radio
suppression kit installed.
Magneto radio suppression kit #378484 for the subject engines, recently announced
in Service Bulletin #SB-851, requires resistor spark plugs to aid in suppressing
magneto ignition noises. This is the only interference suppression kit requiring
resistor plugs. Two (2) are included in each kit.
As a result of this requirement for resistor plugs, the Champion Spark Plug Company
has designed the only resistor plug which is to date approved for use with this kit.
The pertinent information on the plug is as follows:
Manufacturer & Type Johnson Dealer Cost Consumer Price
Part No. Quantity Cost (Motor owner)
Champion XJ4J 378631 1 to 10 $ .87 ea.
10 or more .82 ea. $1.40 ea.
Because this plug is a new one it very probably will not be available from spark
plug jobbers until such time that a sufficient demand has been developed to
justify their stocking it. Also, since the plug is the only one which has been
approved for use in engines equipped with kit #378484, we urge all dealers to
stock this plug by ordering from their respective parts distributors. Order
from them by the Johnson part number.
JOHNSON MOTORS
W. W. DeWees
Service Department
WWD:eb
NOTE: Post on your RD (35 & 40 h.p.) index.