Yamaha F70 User Manual

Maintenance
86
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.
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
the outboard motor is in the water. A
flushing attachment or test tank can be
used.
If the boat is not equipped with a tachometer
for the outboard motor, use a diagnostic ta-
chometer for this procedure. Results may
vary depending on whether testing is con-
ducted with the flushing attachment, in a test
tank, or 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.
Standard spark plug:
F50B DPR6EB-9
F50HB DPR6EB-9
F60B DPR6EB-9
F60HB DPR6EB-9
F70A LKR7E
F70HA LKR7E
T50B DPR6EB-9
T60B 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:
F50B 18 Nm (1.84 kgf-m, 13.3 ft-lb)
F50HB 18 Nm (1.84 kgf-m, 13.3 ft-lb)
F60B 18 Nm (1.84 kgf-m, 13.3 ft-lb)
F60HB 18 Nm (1.84 kgf-m, 13.3 ft-lb)
F70A 17 Nm (1.73 kgf-m, 12.5 ft-lb)
F70HA 17 Nm (1.73 kgf-m, 12.5 ft-lb)
T50B 18 Nm (1.84 kgf-m, 13.3 ft-lb)
T60B 18 Nm (1.84 kgf-m, 13.3 ft-lb)
6C1-9-3B-1E0.book 86 ページ ２０１２年１１月１９日 月曜日 午前１０時３５分

Yamaha F70 Specifications

Engine Specifications

engine type	16-Valve, SOHC In-Line Four Cylinder
displacement	996 cc
bore x stroke	65 x 75 mm
compression ratio	9.4:1

Power

full throttle rpm range	5300 ~ 6300
horsepower rating	70 hp at 5800 rpm
alternator output	17 Amp

Fuel and Lubrication

recommended fuel	Regular Unleaded (Minimum Pump Octane 87)
ethanol blend limit	10% Maximum
engine oil capacity	2.1 L with filter

Weight and Dimensions

weight	118 kg
degree of trim	-4° through +16°
degree of tilt	65°