August 25, 1961
Bulletin No. SB-861
Ignition Systems
SUBJECT: (a). New condenser #580422 for ...
All models of 18, 30, 35 & 40 h.p. engines.
(b). Coil & Condenser usage with test specifications, (page 2).
FIG. 1
(A). NEW CONDENSER #580422: This condenser has
been specially designed with a capacity of
.25 to .29 microfarad, and, for this reason,
MUST be serviced ONLY on those models of the
subject engines as indicated in the chart on
the reverse side of this bulletin. As a
visual means to aid in identification, note
that condenser 580422 is one-eighth (1/8) inch
higher than condenser 580321, figure 1.
Condenser 580422 was designed to eliminate a
field-reported miss from intermediate to high
rpm on the subject engines. Therefore, when-
ever there is an indication of a miss on any
of the subject engines (also sometimes des-
cribed as rpm fluctuation at full throttle),
replace the 580321 condensers with this new 580422 unit. It is recommended these
new condensers be installed on all subject engines whenever they are brought in for
service to insure against the possibility of a miss developing at a later time.
Condenser #580422 is available from your parts distributor at the list price of $.90
each which is subject to the standard parts discount.
Servicing engines UNDER 18 h.p.: Condenser #580321 is still retained for servicing
engines under 18 h.p. This is necessary because the greater capacity of condenser
580422 would permit excessive build-up on the breaker points if used in the small
engines. Therefore, to obtain maximum breaker point life, condenser 580321 must
now be serviced only on those engines as indicated in the chart on the reverse side
of this bulletin. Because of this service requirement, dealer and distributor stocks
of condenser 580321 are still necessary. Inventories of condenser 510173, if still
existent, can also be used to service engines under 18 h.p., but must not be used in
18 h.p. engines and higher.
To avoid the possibility of inadvertently mismatching condensers and engines, we recommend
that the condenser part numbers in all parts catalogs for the subject 18, 30, 35 and 40 h.p.
engines be corrected to read 580422.
JOHNSON MOTORS
W. W. DeWees
Service Department
WWD:eb
NOTE: Post on your Miscellaneous index.
Destroy Service Bulletin No. SB-825, dated 1/15/61.
