Yamaha RAPTOR YFM660R Owner's Manual page 310

a. Spark plug gap
a. Écartement des électrodes
a. Huelgo de la bujía
Specified spark plug:
DPR8EA-9 (NGK)
Installation
1. Measure the electrode gap with a wire thick-
ness gauge and, if necessary, adjust the gap
to specification.
Spark plug gap:
0.8–0.9 mm
2. Clean the gasket surface. Wipe off any grime
from the threads.
3. Install the spark plug and tighten it to the
specified torque.
Tightening torque:
Spark plug:
17.5 Nm (1.75 m·kgf)
NOTE:
_
If a torque wrench is not available when you are in-
stalling a spark plug, a good estimate of the correct
torque is 1/4 to 1/2 turn past finger tight. Have the
spark plug tightened to the specified torque as
soon as possible.
_
4. Install the spark plug cap.
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