Yamaha EF6300iSDE Owner's Manual page 35

5. Install the spark plug.
Spark plug torque:
20 Nm (2.0 m·kgf, 14 ft·lbf)
TIP
If a torque wrench is not available when installing a
spark plug, a good estimate of the correct torque is
1/4-1/2 turn past finger tight. However, the spark plug
should be tightened to the specified torque as soon as
possible.
6. Install the spark plug cap.
7. Install the front cover and tighten the screws.
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