Filter
Top Products
Engine
Maintenance
4 Clean Cooling System Grass
or chaff may clog cooling sys-
tem after prolonged service.
Continued operation with a
clogged cooling system causes
severe overheating and possi-
ble engine damage. Remove
blower housing and clean
regularly.
~
Ir:===;
~
9,
({J
'==""'/
,-J ,
-~4d~[=.ifL.
5 Spark Plug Clean and reset gap
at .030" every 100 hours of
operation.
Refer to chart on page 19 for
replacement spark plugs.
Caution: Blast cleaning of
spark plugs in machines that
use abrasive grit is not recom-
mended. Spark plugs should
be cleaned by scraping or wire
brushing and washing with a
commercial solvent or gaso-
line.
Refer to chart on page 19 for
replacement spark plugs.
6 Remove Carbon Deposits
Clean combustion chamber.
top of piston and around both
valves every 100-300 hours of
operation.
The use of unleaded gasoline is
recommended because of less build-up
of deposits in the combustion
chamber.
Adjustments
7 Carburetor Adjustment. Minor
carburetor adjustment may be
required to compensate for
differences in fuel, temperature,
altitude and load.
To adjust the carburetor. turn the
needle valve clockwise until it
just closes.
Caution: Valve may be damaged
by turning it in too far.
Now open the needle valve 1 Ys
turns counter clockwise. Close the
idle valve in the same manner and
open 1 Ys turns. This initial
adjustment will permit the engine
to be started and warmed up prior
to final adjustment.
Final Adjustment: Turn the needle
valve in until the engine misses
(lean mixture) then turn it out past
smooth operating point until the
engine runs unevenly (rich
mixture); now turn the needle valve
to the mid-point between rich and
lean so the engine runs smoothly