Yamaha F25D - Checking Fuel Filter; Inspecting Idle Speed

Maintenance
69
move and inspect the spark plug because
heat and deposits will cause the spark plug
to slowly break down and erode.
1. Remove the spark plug caps from the
spark plugs.
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.
[EWM00561]
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.
4. 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, 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
correct torque as soon as possible with a
torque-wrench.
EMU37450
Checking fuel filter
Check the fuel filter periodically. If any water
or foreign matter is found in the filter, clean or
replace it. For cleaning or replacement of the
fuel filter, consult your Yamaha dealer.
EMU29044
Inspecting idle speed
WARNING
EWM00451
● 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.
NOTICE
ECM00490
This procedure must be performed while
Standard spark plug:
DPR6EB-9
1. Spark plug gap
2. Spark plug part number
3. Spark plug I.D. mark (NGK)
Spark plug gap:
0.8–0.9 mm (0.031–0.035 in)
Spark plug torque:
17.0 Nm (1.73 kgf-m, 12.5 ft-lb)
ZMU06513
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