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IMPORTANT: Replace a cracked, fouled, or
dirty spark plug. Do not sand blast, scrape, or
clean electrodes because engine damage could
result from grit entering cylinder.
3. Set air gap at 0.020” (0.50 mm) (Fig. 17). Install
correctly gapped spark plug and gasket seal.
Tighten plug firmly to 14 ft–lb (19 Nm).
Draining Gasoline
1. Stop engine and wait for engine to cool. Pull
wire off spark plug.
Note: Drain gasoline from a cold engine
only.
2. Remove cap from fuel tank. Use a pump-type
syphon to drain fuel into clean gas can.
Note: This is the only procedure
recommended for draining fuel.
Changing Crankcase Oil
and Filter
Change oil after the first 5 operating hours and then
after every 50 hours or every season. Change oil
while engine is warm. Replace the oil filter (Fig. 18)
after every 100 operating hours or yearly, whichever
occurs first.
Note: Change oil every 25 hours when
operating under heavy load or in high
temperatures.
1. Stop engine and wait for all moving parts to
stop. Pull wire off spark plug.
2. Remove grass bag. Drain gasoline from fuel
tank: refer to DRAINING GASOLINE section.
3. Remove dipstick from oil fill tube and place a
drain pan next to left side of mower.
4. Tip mower on its left side, allowing oil to drain
into drain pan (Fig. 18).
5. When oil is drained, return mower to upright
position and add fresh oil to engine. Refer to
OIL section in BEFORE STARTING chapter.
Adjusting Throttle
Throttle control adjustment may be required if engine
does not start. Whenever a new throttle control cable
is installed, throttle must be adjusted.
1. Stop engine and wait for all moving parts to
stop. Pull wire off spark plug.
2. Loosen cable clamp screw until throttle cable
slides (Fig. 19).
3. Move governor control lever, throttle cable and
casing in direction of arrow as far as possible
(Fig. 19). Move throttle control to
(FAST
position). Tighten cable clamp screw to lock
adjustment in place.
Cleaning Cooling System
After every 100 operating hours or every season,
clean dirt and chaff from cylinder, cylinder head fins
and from around carburetor and linkage. Also remove
debris from air intake slots on recoil housing. This
will ensure proper cooling and best engine
performance.
Adjusting Wheel Drive
(self-propelled model only)
If mower does not self-propel or self-propels when
control bar is more than 1-1/2 inches from the
handle, adjust wheel drive control knob on rear of
gear box.
1. Close door in mower housing and remove grass
bag.
2. ADJUSTMENT (Fig. 20)—Rotate control knob
clockwise 1/2 turn if mower does not self-propel.
If mower creeps forward, rotate knob 1/2 turn
counterclockwise to loosen belt.