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CLEAN COOLING SYSTEM •— Grass, chaff or dirt may
clog the rotating screen and the air cooling system
after prolonged service in cutting tall dry grasses or
hay. Yearly or every 100 hours, whichever occurs first,
remove the blower housing and clean the area shown to
avoid overspeeding, overheating and engine damage.
Clean more often if necessary.
DANGER: Periodically clean muffler area to remove all
grass, dirt and combustible debris,
SPARK PLUG — Clean and reset gap at .030" every 100
hours of operation.
CAUTION: Do not blast clean spark plug. Spark plug
should be cleaned by scraping or wire brushing and
washing with a commercial solvent.
Sparking can bccur If wire terminal does not fit firmly on
spark plug, or If stop switch vibrates against spark plug.
Reform terminal or repair switch If necessary.
REMOVE COMBUSTION DEPOSITS every 100-300 hours
of operation. Remove cylinder head and cylinder head
shield. Scrape and wire brush the combustion deposits
from cylinder, cylinder head, top of piston and around
valves. Use a soft brush to remove deposits. Re-assemble
gasket, cylinder head and cylinder head shield. Turn
screws down finger tight. Torque cylinder head screws In
a staggered sequence to 165 inch pounds (18.65 Nm).
SPARK ARRESTER EQUIPPED MUFFLER — If engine
muffler Is equipped with spark arrester screen assembly,
remove every 50 hours for cleaning and inspection.
Replace if damaged.
ADJUSTMENTS
CARBURETOR ADJUSTMENTS
Minor carburetor adjustment may be required to com¬
pensate for differences in fuel, temperature, altitude
or load.
TO ADJUST CARBURETOR — Turn needle valve clock¬
wise until it just closes.
5
CAUTION: Valves may be damaged by turning them too
far.
Now open needle valve Vh turns counterclockwise. Close
idle valve in same manner and open 114 turn. This initial
adjustment will permit the engine to be started and warmed
up prior to final adjustment.
Place governor speed control lever in "FAST" position.
Turn needle valve in until engine-slows (clockwise — lean
mixture). Then turn It out past smooth operating point (rich
mixture). Now turn needle valve to midpoint between.rich
and lean. Next, adjust idle RPM. Rotate throttle counter¬
clockwise and hold against stop. Adjust Idle speed
adjusting screw to obtain 1750 RPM. Holding throttle
against idle stop, turn idle valve In (lean) and out (rich). Set
at midpoint between rich and lean. Re-check idle RPM.
Release throttle. If engine will not accelerate properly, the
carburetor should be re-adjusted, usually to a slightly
richer mixture.
CONTROL ADJUSTMENTS
Proper choke and stop switch operation is dependent upon
proper adjustment of remote controls on the powered
equipment.
TO CHECK OPERATION OF CHOKE CONTROLS:
Move remote control lever to "Choke" position. The
carburetor choke should be closed.
TO ADJUST CHOKE:
Place remote control lever on equipment in "CHOKE"
position. Loosen control casing clamp screw. Move casing
and wire In direction shown by arrow. Tighten casing clamp
screw.
TO ADJUST CHOKE-A-MATIC CONTROLS;
Place remote speed control lever on equipment in FAST
(high speed) position. Loosen control casing clamp screw
"C." Move control easing "A" and wire until lever "E" lines
up with bottom edge of tang "F." Tighten casing clamp
screw "C." Move remote control to "STOP" position. Lever
should make good contact with stop switch, if so equipped.
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