Garland ULTIMATE 820 QG Manuel D'instructions page 48

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8.2.3. CHECKING THE SPARK PLUG
When it comes to starting a machine, the most
common problems are produced by a dirty spark plug
or one in poor condition. Clean and check the spark
plug regularly.
Check that the electrode gap is correct (0.6 - 0.7
mm).
8.2.4. CLEANING THE CYLINDER FINS
The cylinder fins are responsible for the cooling of the
engine due to its contact with the air. These fins must
be clean and without any material including those that
limit the flow of air.
A few dirty fins will make the motor to overheat and
can be dangerous. Check the condition of the cylinder
fins regularly.
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