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20
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
y
ea
r
150 hours of
use or every
two
y
ears
Blade Inspec
t
x
Blade
mounting
b
ol
t
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
Blade
control
operation
Check x x
Spark plug
Check x
Replace x
Fuel tank Clean x
Flywheel
b
rake pad
Check x
Valve
clearance
Check-
ad
j
us
t
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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