DuroStar DS5000X User Manual page 51

4.
Replace if necessary
If it is cracked or chipped, discard and replace it with a new
spark plug. We recommend using an F7RTC spark plug such
as NGK BP6ES.
5.
Install spark plug
Screw the spark plug back into its place on the generator
using the spark plug wrench.
6.
Replace spark plug cap
Replace the spark plug cap.
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