Maintenance
94
6.
Remove the spark plug. If electrode ero-
sion becomes excessive, or if carbon
and other deposits are excessive, you
should replace the spark plug with an-
other of the correct type.
WARNING!
When removing or installing a spark
plug, be careful not to damage the in-
sulator. A damaged insulator could
allow external sparks, which could
lead to explosion or fire.
[EWM00561]
7.
Be sure to use the specified spark plug,
otherwise the engine may not operate
properly. Before fitting the spark plug,
measure the electrode gap with a wire
thickness gauge; adjust the gap to spec-
ification if necessary.
8.
When fitting the plug, wipe off any dirt
from the threads, and then screw it in to
the correct torque.
TIP:
If a torque-wrench is not available when you
are fitting a spark plug, fully tighten a spark
plug with a spark plug wrench. Then tighten
1/4 to 1/2 turn more. Have the spark plug ad-
justed to the correct torque as soon as pos-
sible with a torque-wrench.
9.
Install the ignition coil and tighten the
bolts.
10. Fasten the plate and install the bolts.
11. Install the covers of both port and star-
board sides, and tighten the bolts.
Standard spark plug:
LFR6A-11
1. Spark plug gap
ZMU05903
2. Spark plug I.D. mark (NGK)
3. Spark plug part number
Spark plug gap:
1.0–1.1 mm (0.039–0.043 in)
Spark plug torque:
28.0 Nm (2.86 kgf-m, 20.7 ft-lb)
Bolt tightening torque:
9.0 Nm (0.9 kgf-m, 6.6 ft-lb)
Bolt tightening torque:
8.0 Nm (0.8 kgf-m, 5.8 ft-lb)
ZMU05902
©
2019 Yamaha Motor Corporation, U.S.A.
Summary of Contents for F300
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