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17
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 0.028-0.031 inch.
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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