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Maintenance
CAUTION
POTENTIAL HAZARD
Engine could start accidentally.
WHAT CAN HAPPEN
Accidental starting of engine could cause
serious injury to operator or
bystanders.
HOW TO AVOID THE HAZARD
Pull wire off spark plug before performing any
maintenance or adjustments.
Servicing Air Cleaner
Normally, clean air cleaner after every 25 operating hours.
More frequent cleaning is required when mower is
operated in dusty or dirty conditions.
1. Stop engine and pull wire off spark plug (Fig. 19).
2. Lift tabs at top of air cleaner cover and pivot cover
down. Clean cover thoroughly (Fig. 19).
1
2
Figure 19
1. Spark plug wire
2. Primer
3. If outside of foam element is dirty, remove it from air
cleaner body (Fig. 19). Clean thoroughly.
A. WASH foam element in a solution of liquid soap
and warm water. Squeeze to remove dirt, but do
not twist because foam may tear. Rinse thoroughly
in clear water.
B. DRY by wrapping in a clean rag. Squeeze rag and
foam element to dry.
C. SATURATE element with engine oil. Squeeze
element to remove excess oil and to distribute oil
thoroughly. A damp element is desirable.
3
4
196
3. Cover
4. Foam element
16
4. Reinstall foam element and air cleaner cover.
IMPORTANT: Do not operate engine without air
cleaner element because extreme engine wear and
damage will likely result.
Replacing Spark Plug
Use an NGK BPMR4A spark plug or equivalent. Correct
air gap is 0.81 mm (0.032"). Remove plug after every 25
operating hours and check its condition.
1. Stop engine and pull wire off spark plug.
2. Clean around spark plug and remove plug from
cylinder head.
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 0.81 mm (0.032") (Fig. 20). Install
correctly gapped spark plug and gasket seal. Tighten
plug firmly to 13.6 N m (10 ft–lb).
Figure 20
Draining Gasoline
1. Stop engine. Pull wire off spark plug.
Note: Drain gasoline from a cold engine only.
2. Remove cap from fuel tank and use pump–type syphon
to drain fuel into clean gas can.
Note: This is the only procedure recommended for
draining fuel.
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 pull wire off spark plug.
2. Move throttle control to
3. Loosen cable clamp screw until throttle cable slides
(Fig. 21). Align holes in choke arm and throttle
bracket. A small dia. pin may be inserted into aligned
110
(FAST).
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