EBERTH GG4-JS7200 Instruction Manual page 76

Remove the spark plug connector
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Loosen the spark plug using the spark plug wrench
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Spark plug connector
Check the spark plug for discolouration (standard colour light brown).
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Remove the deposits from the spark plug.
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Check the electrode gap and adjust to the set value of 0.7-0.8mm if necessary.
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Replace the spark plug if necessary. (Type F6RTC is recommended)
See "Maintenance table" p.34
Fig. 30
Fig. 32
Spark plug wrench
Fig. 31
33