IGNITION, COOLING AND EXHAUST SYSTEM
HOURS OF OPERATION:
AND MUFFLER SHOULD BE REMOVED.
ING PASSAGES AND CYLINDER
FINS SHOULD BE CLEANED.
SPARK PLUG
T PORT DOES NOT
Y REQUIRE CLEANING
in the starter housing or around the muffler.
2.
Occasionally, (perhaps every 50 operating hours) the
MUFFLER BOD
muffler and starter assemblies should be removed fora
LONG SPACE
thorough cleaning of the cooling air passage, includ-
ing the slots formed by the cylinder fins.
3.
The engine has a miniature, self-sealing tapered seat
SPARK ARRESTOR
type Champion #DJ-7J spark plug. Whenever there is
trouble starting the engine, always immediately
re-
SHORT SPACER
place it with a new DJ-7J plug (or its equivalent of the
same type and heat range). Leave the new plug in the
saw at least until you have found the troubleand gotten
the saw started.
4. When installing the tapered seat type spark plug in this
engine, you must get a gas-tight seal without over-
tightening the plug. To do this, first make the plug
MUFFLER CAP
finger tight and then use the spark plug wrench to
tighten 1/16 turn more.
MUFFLER SCRE
5. The most frequent cause of ignition trouble is spark
plug fouling. This can be due to a build-up of hard
engine deposits, but is often due to soft deposits or
merely wetness caused by a) flooding, b) improper
fuel of some nature, c) wrong adjustment of the
carburetor idle mixture or prolonged idling of the
engine, and d) wrong spark plug gap setting.
GAP
.025"
6.
Fouled plugs often can be restored, first by cleaning
sandblasting are not recommended, as these methods
and then by resetting the firing gap.
drive into the plug harmful particles which cannot be
re-
moved with solvent.
NOTE
The metal electrodes should be filed or scraped down
Cleaning by hand-brushing or hydro-honing followed by
to the bare metal, then gapped to
,025"
(0.64mm) by
a rinse in solvent is recommended. Power-brushing or
bending the side electrode toward the center electrode.
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