Inspecting Engine Idle Speed - Yamaha F350 Owner's Manual

Maintenance
2
1. Bolt
2. Ignition coil
Remove the spark plug. WARNING! When removing
3.
or installing a spark plug, be careful not to damage
the insulator. A damaged insulator could allow ex-
ternal sparks, which could lead to explosion or fire.
[EWM00562]
To check the spark plug
1. Check the condition of the spark plug. If electrode ero-
sion becomes excessive or carbon and other deposits
are excessive, replace the spark plug with the specified
plug.
Standard spark plug:
LFR6A-11
2. Measure the spark plug gap using a thickness gauge. If
the spark plug gap is out of specification, replace the
spark plug with the specified plug.
1. Spark plug gap
2. Spark plug part number
3. Spark plug I.D. mark (NGK)
Spark plug gap:
1.0–1.1 mm (0.039–0.043 in)
To install the spark plug
1. Wipe off any dirt from the threads, insulator, and gasket
surface of the spark plug.
2. Install the spark plug, and then tighten it to the specified
torque.
67
1
ZMU07702
Spark plug tightening torque:
28 Nm (2.86 kgf-m, 20.7 ft-lb)
TIP:
If a torque-wrench is not available when you are reinstalling
a spark plug, a good estimate of the correct torque is 1/12
turn past finger-tight. When you are installing a new spark
plug, a good estimate of the correct torque is 1/2 to 2/3 turn
past finger-tight.
3. Install the ignition coil, and then tighten the bolt to the
specified torque.
2
1. Bolt
2. Ignition coil
Bolt tightening torque:
9 Nm (0.92 kgf-m, 6.6 ft-lb)
4. Fit the four positions and install the covers of both port
and starboard sides securely.
1
1. Cover
EMU41872

Inspecting engine idle speed

ECM01691
This procedure must be performed while the outboard
motor is in the water.
Inspect the engine idle speed using the meter that is
equipped on the boat. Results may vary depending on
whether testing is conducted with the outboard motor in the
water.
1. Start the engine and allow it to warm up fully in neutral
until it is running smoothly.
1
ZMU07703
1
ZMU07705