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18
CAUTION: running the engine with dirty, damaged or missing air cleaner element will cause the
engine to wear out prematurely.
SPARK PLUG MAINTENANCE
The spark plug is important for proper engine operation. A good spark plug should be intact, free of
deposits, and properly gaped. Refer to Recommended Maintenance Schedule. To inspect the spark
plug:
1. Remove spark plug boot. Be careful not to tear insulation or wire.
2. Unscrew the spark plug from the engine using the spark plug wrench provided. There is limited
space for the wrench to turn. Use both rows of holes in the spark plug wrench to gain leverage to
loosen the plug.
3. Visually inspect the spark plug for cracks or excessive electrode wear. Replace as necessary.
4. Measure the plug gap with a wire gauge. The gap should be 0.7 to 0.8 mm (0.028-0.031 in).
5. If re-using the spark plug, use a wire brush to clean any dirt from around the spark plug base then
re-gap the spark plug.
6. Screw the spark plug back into the spark plug hole using the spark plug wrench. Do not
over-tighten spark plug. Recommended tightening of spark plug is ½ to ¾ of a turn after spark
plug gasket contacts spark plug hole. Reinstall the spark plug boot.
Maintenance Schedule
Item Action Before
each
use
5 Hours of
use or first
month
First 25
hours
of
use
50 hours of
use or every
6
months
100 hours
of use or
every
year
150 hours of
use or every
two
years
Blade
Inspect
x
Blade
mounting
bolt
Inspect x
Engine oil
Check
x
Change x x
2
x x
Air filter
Check
x
Clean x
1
x
1
x
1
Replace
x
Grass
bag
Check
x
Blade control
operation
Check x x
Spark plug
Check
x
Replace
x
Fuel
tank
Clean
x
Flywheel
brake
pad
Check x
Valve
clearance
Check-
adjust
x
Fuel
line
Check
Check
every
2
years
and
replace
if
necessary
1.
Service
more
frequently
when
used
in
dusty
areas.
2.Change engine oil every 25 hours when used under heavy load or in high outside air temperatures.
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