Spark Plug Service; Spark Arrester Screen Service - Champion 100379 Operator's Manual

100379 - FRONT TINE TILLER
We consider the first 5 hours of run time to be the break-
in period for the engine. During the break in period we
recommend using standard automotive non-synthetic
blended oils. After the break in period synthetic oil can
be used but is not required. Adjusting throttle setting will
increase/decrease engine speed helping to seat piston
rings. Avoid bogging or lugging the engine down and avoid
prolonged running at constant RPM. After the 5 hour
break-in period, change the oil. Using synthetic oil does not
increase the recommended oil change interval.
Weather will affect engine oil and engine performance.
Change the type of engine oil used based on weather
conditions to suit the engine needs.
Synthetic oil may be used after the 5 hour initial break-
in period. Using synthetic oil does not increase the
recommended oil change interval. Full synthetic 5W-30 oil
will aid in starting in cold ambient <5º C (41º F).
Air Cleaner Maintenance
A dirty air cleaner can restrict air flowing into the carburetor. To
keep the carburetor in good working conditions, please service
the air cleaner periodically. If operating the engine in extremely
dusty area, servicing should be done more often.
Never clean the air cleaner element with gasoline or low
flash-point detergents, an explosion may happen.
Never run the engine without an air cleaner. Dirty air
entering the engine can speed up engine wear.
1. Remove the air cleaner cover and take the element out.
2. Paper element: Wash the element with home detergents
and warm water (or non-flammable or high flash-point
cleansing solvents) and dry.
Foam element: Soak in clean engine oil until saturated.
Squeeze out excess oil; otherwise, the engine will smoke
when starting.
3. Clean the air cleaner cover and inner surface with a damp
cloth, be careful not to allow dust to enter the carburetor.
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4. Reinstall the element and reinstall the air cleaner cover.

Spark Plug Service

Spark plug type: F6RTC/F6TC/F7RTC/F7TC
For normal engine operation, ensure the spark plug gap is
correct and check for carbon deposit around the spark plug.
1. Remove the spark plug cap.
2. Clear away dirt around the spark plug base.
3. Dismantle the spark plug with a spark plug wrench.
4. Visually check the spark plug. Clean with a steel brush. If
the insulator is damaged, replace the spark plug.
5. Measure the spark plug clearance with a spark plug gap
gauge. The clearance should be 0.7-0.8 mm. If adjustment
is necessary, bend the side electrode carefully.
6. Check if the spark plug gasket is in good condition. To
prevent cross threading, screw in by hand.
7. Screw in the spark plug to the bottom first by hand and
then screw in by a spark plug wrench and compress the
gasket.
7a. If a new spark plug is used, twist another 1/2 turn after
compressing the gasket.
7b. If reinstalling a used spark plug, only twist another
1/8-1/4 turn.
Don't touch the muffler when the engine is running or hot.
The spark plug must be tightened securely, or it may
become very hot and damage the engine.

Spark Arrester Screen Service

If the engine muffler is equipped with a spark arrester screen,
remove and clean it according to the service intervals.
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