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13
SPARK PLUG
1. Check plug gap. Correct gap is 0.6 - 0.7 mm.
2. Inspect electrode for wear.
3. Inspect insulator for oil or other deposits.
4. Replace plug if needed and tighten to 15 - 17 N
·
m (150
to 170 kgf
·
cm).
NOTE
Do not overtighten spark plug.
0.6 - 0.7 mm
COOLING SYSTEM MAINTENANCE
NOTE
To maintain proper engine operating temperatures, cooling
air must pass freely through the cylinder fin areas. This
flow of air carries combustion heat away from the engine.
Overheating and engine seizure can occur when:
• Air intakes are blocked preventing cooling air from reach-
ing the cylinder, or
• Dust and grass build up on the outside of the cylinder.
This build up insulates the engine and prevents the heat
from leaving.
Removal of cooling passage blockages or cleaning of
cylinder fins is considered "Normal Maintenance." Any
resultant failure attributed to lack of maintenance is not
warranted.
The cooling system relies on cooling air entering the engine
through a grille located between the fuel tank and starter.
The cooling fan pushes this air through the cylinder area
and out the forward facing opening in the engine cover.
Remove accumulated debris from intake grille for cleaning.
Intake grille
SILENCER AND EXHAUST PORT
NOTE
Carbon deposits in cylinder exhaust port and silencer will
cause a drop in engine output and overheating. Silencer
exhaust port and screen must be checked.
1. Remove spark plug, engine cover, gasket and silencer.
2. Place piston at top dead center. Clean deposit from
silencer and cylinder exhaust port.
NOTE
Be careful not to scratch the cylinder or piston when clean-
ing the cylinder exhaust port.
3. Remove spark arrester cover, exhaust diffuser, gasket
and screen from silencer. Replace screen if plugged with
carbon deposits.
4. Inspect gaskets, replace if damaged.
5. Install spark arrester screen, gasket, diffuser and cover.
6. Install silencer, gasket and engine cover.
Spark arrester cover
Exhaust diffuser
Gasket
Screen