Yamaha F70 User Manual

Maintenance
85
F50HB, F60HB, F70HA
EMU28958
Cleaning and adjusting spark plug
The spark plug is an important engine com-
ponent and is easy to inspect. The condition
of the spark plug can indicate something
about the condition of the engine. For exam-
ple, if the center electrode porcelain is very
white, this could indicate an intake air leak or
carburetion problem in that cylinder. Do not
attempt to diagnose any problems yourself.
Instead, take the outboard motor to a
Yamaha dealer. You should periodically re-
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-
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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°