Page 70 of 496
4-1 1. Main switch a. OFF b. ON c. START
1. Contacteur à cléa. OFF (arrêt)
b. ON (contact) c. START (mise en marche)
1. Interruptor principal a. OFF (desconectado)
b. ON (conectado) c. START (arranque)
OFFONSTART
1a
b
c
EVU00130
1 -INSTRUMENT AND CONTROL
FUNCTIONS
EVU00140
Main switch
Functions of the respective switch positions are as
follows:
ON:
All electrical circuits are supplied with power,
and the helmet/seat belt indicator light comes
on.TIPTIPThe headlights and taillights come on when the
light switch is set to “” or “”.OFF:
All electrical circuits are switched off. The key
can be removed in this position.
START:
The electric starter is engaged by turning and
holding the key in this position. Release the
key when the engine starts.
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Page 96 of 496
4-27 1. Light switch “OFF/ /”
1. Contacteur d’éclairage “OFF/ /”
1. Interruptor de las luces “OFF (apagado)/ /”
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L
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EVU00230
Switches
EVU00240
Light switch “OFF/ /”
Set the switch to “” to turn on the low beam and
the taillights.
Set the switch to “” to turn on the high beam
and the taillights.
Set the switch to “OFF” to turn off the headlights
and taillights.NOTICEDo not use the headlights with the engine
turned off for an extended period of time. The
battery may discharge to the point that the
starter motor will not operate properly. If this
should happen, remove the battery and re-
charge it.
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6-9
The engine can be started in any gear if
the brake is applied. However, it is recom-
mended to shift into neutral before starting
the engine.
4. With your foot off the accelerator pedal, start
the engine by turning the key to “START”.
If the engine fails to start, release the key, and then
try starting it again. Wait a few seconds before the
next attempt. Each attempt should be as short as
possible, to preserve battery energy. NOTICE: Do
not crank the engine more than 5 seconds on
each attempt, or starter damage could occur.
Wait at least 5 seconds between each opera-
tion of the electric starter to let it cool.
Do not turn the key to the “START” position with
the engine running, or damage to the electric start-
er may result.
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8-157
5B410024
Troubleshooting charts
Starting problems or poor engine performance1. Fuel
Check if there is fuel
in the fuel tank.There is fuel.
Restart the engine.
No fuel.Supply fuel.
2. Compression
Use the electric
starter to see if
there is compression.There is compression.
Compression normal.
No compression.Ask a Yamaha dealer to
inspect.
3. Ignition
Remove the
spark plug and
check the electrodes.WetWipe clean with dry cloth.
DryAttach spark plug cap and
ground to chassis.Use the
electric starter.Spark is good.Ignition system is
normal.
Spark is weak.
Adjust the spark plug gap
or replace the spark plug. No spark.
Ask a Yamaha dealer to
inspect. 4. Battery
Use the electric starter.Engine turns over
quickly.Battery is good.
Engine turns over
slowly.Check the connections,
recharge.
Check the compression.
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10-2
10
Engine:
Engine type Liquid cooled 4-stroke, SOHC
Cylinder arrangement Forward-inclined single cylinder
Displacement 686.0 cm
3
Bore × stroke 102.0 × 84.0 mm (4.02 × 3.31 in)
Compression ratio 9.20:1
Starting system Electric starter
Lubrication system Wet sumpModel YXR70FSP2Y
EE.book Page 2 Tuesday, June 17, 2008 9:00 AM