Checking Fuel Filter; Inspecting Idling Speed - Yamaha 8 Owner's Manual

Maintenance
2. 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.
Standard spark plug:
B7HS-10
3. 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; replace it if out of spec-
ification.
1. Spark plug gap
2. Spark plug part number
3. Spark plug I.D. mark (NGK)
Spark plug gap:
0.9–1.0 mm (0.035–0.039 in)
4. When fitting the plug, wipe off any dirt
from the threads, and then screw it in to
49
TIP:
If a torque-wrench is not available when you
are fitting a spark plug, a good estimate of
the correct torque is 1/4 to 1/2 a turn past fin-
ger-tight. Have the spark plug adjusted to the
[EWM00561]
correct torque as soon as possible with a
torque-wrench.
EMU28990

Checking fuel filter

Check the fuel filter periodically. The fuel fil-
ter is a one piece, disposable type. If foreign
matter is found in the filter, replace it. For re-
placement of the fuel filter, consult your
Yamaha dealer.
EMU29043

Inspecting idling speed

EWM00451
G
G
ECM00490
NOTICE
This procedure must be performed while
the correct torque.
Spark plug torque:
25.0 Nm (2.55 kgf-m, 18.4 ft-lb)
WARNING
Do not touch or remove electrical parts
when starting or during operation.
Keep hands, hair, and clothes away
from the flywheel and other rotating
parts while the engine is running.
ZMU02874