Yamaha SCORPIO 54D Owner's Manual page 43

1. Spark plug gap
To install the spark plug
1. Measure the spark plug gap with a
wire thickness gauge and, if nec-
essary, adjust the gap to specifica-
tion.
Spark plug gap:
0.7–0.8 mm (0.027–0.031 in)
2. Clean the surface of the spark plug
gasket and its mating surface, and
then wipe off any grime from the
spark plug threads.
3. Install the spark plug with the
spark plug wrench, and then tight-
en it to the specified torque.
PERIODIC MAINTENANCE AND MINOR REPAIR
Tightening torque:
Spark plug:
17.5 Nm (1.75 m·kgf, 10.1 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 speci-
fied torque as soon as possible.
4. I nstall the spark plug cap.
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