Yamaha 4SH-28199-67 Owner's Manual page 290

a. Spark plug gap
a. Écartement des électrodes
a. Huelgo de la bujía
Installation
1. Measure the electrode gap with a wire
thickness gauge and, if necessary, adjust
the gap to specification.
Spark plug gap:
0.6 ~ 0.7 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·kg)
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