Build Worker BG4200R Manuel D'utilisation page 58

6. Attach the plug washer and thread the plug in by hand to prevent
cross threading.
7. After a new spark plug has been seated by hand, it should be
tightened 1/2 turn with a wrench to compress its washer.
If a used plug is being reinstalled, it should only require 1/8 to 1/4
turn after being seated.
CAUTION:
● The spark plug must be securely tightened. An improperly
tightened plug can become very hot and possibly damage the
generator.
● Never use a spark plug with an improper heat range.
57