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Yamaha F70 User Manual

Yamaha F70
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95
Trouble Recovery
EMU29427
Troubleshooting
A problem in the fuel, compression, or igni-
tion systems can cause poor starting, loss of
power, or other problems. This section de-
scribes basic checks and possible remedies,
and covers all Yamaha outboard motors.
Therefore some items may not apply to your
model.
If your outboard motor requires repair, bring
it to your Yamaha dealer.
If the engine trouble-alert indicator is flash-
ing, consult your Yamaha dealer.
Starter will not operate.
Q. Is battery capacity weak or low?
A. Check battery condition. Use battery of
recommended capacity.
Q. Are battery connections loose or corrod-
ed?
A. Tighten battery cables and clean battery
terminals.
Q. Is fuse for electric start relay or electric cir-
cuit blown?
A. Check for cause of electric overload and
repair. Replace fuse with one of correct am-
perage.
Q. Are starter components faulty?
A. Have serviced by a Yamaha dealer.
Q. Is shift lever in gear?
A. Shift to neutral.
Engine will not start (starter operates).
Q. Is fuel tank empty?
A. Fill tank with clean, fresh fuel.
Q. Is fuel contaminated or stale?
A. Fill tank with clean, fresh fuel.
Q. Is fuel filter clogged?
A. Clean or replace filter.
Q. Is starting procedure incorrect?
A. See page 63.
Q. Has fuel pump malfunctioned?
A. Have serviced by a Yamaha dealer.
Q. Are spark plug(s) fouled or of incorrect
type?
A. Inspect spark plug(s). Clean or replace
with recommended type.
Q. Are spark plug cap(s) fitted incorrectly?
A. Check and re-fit cap(s).
Q. Is ignition wiring damaged or poorly con-
nected?
A. Check wires for wear or breaks. Tighten
all loose connections. Replace worn or bro-
ken wires.
Q. Are ignition parts faulty?
A. Have serviced by a Yamaha dealer.
Q. Is engine shut-off cord (lanyard) not at-
tached?
A. Attach cord.
Q. Are engine inner parts damaged?
A. Have serviced by a Yamaha dealer.
Engine idles irregularly or stalls.
Q. Are spark plug(s) fouled or of incorrect
type?
A. Inspect spark plug(s). Clean or replace
with recommended type.
6C1-9-3B-1E0.book 95 ージ 012年11月19日 月曜日 午前10時35分

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Yamaha F70 Specifications

Engine Specifications IconEngine Specifications
engine type16-Valve, SOHC In-Line Four Cylinder
displacement996 cc
bore x stroke65 x 75 mm
compression ratio9.4:1
Power IconPower
full throttle rpm range5300 ~ 6300
horsepower rating70 hp at 5800 rpm
alternator output17 Amp
Fuel and Lubrication IconFuel and Lubrication
recommended fuelRegular Unleaded (Minimum Pump Octane 87)
ethanol blend limit10% Maximum
engine oil capacity2.1 L with filter
Weight and Dimensions IconWeight and Dimensions
weight118 kg
degree of trim-4° through +16°
degree of tilt65°

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