Yamaha XT660R S Service Manual

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ELEC
LIGHTING SYSTEM
EAS00788
CHECKING THE LIGHTING SYSTEM
1. The headlight and the high beam indicator
light fail to come on.
YES
NO
YES
NO
YES
NO
1. Headlight bulb and socket
• Check the headlight bulb and socket for
continuity.
Refer to “CHECKING THE BULBS AND
BULB SOCKETS”.
• Are the headlight bulb and socket OK?
Replace the head-
light bulb, socket or
both.
2. High beam indicator light LED
• Check the LED of the high beam indicator
light.
Refer to “CHECKING THE BULBS AND
BULB SOCKETS”.
• Is the high beam indicator light LED OK?
Replace the meter
assembly.
3. Voltage
• Connect the pocket tester (DC 20 V) to the
headlight and meter assembly couplers as
shown.
È
When the dimmer switch is set to “ ”
É
When the dimmer switch is set to “ ”
Headlight coupler (wire harness end)
DC 20 V
+
BY
G
2
1
3
È
É
Headlight
Positive tester probe →
yellow 1 or green 2
Negative tester probe → black 3
High beam indicator light
Positive tester probe → yellow 4
Negative tester probe → black/white 5
Meter assembly couplers (wire harness end)
• Set the main switch to “ON”.
• Start the engine.
• Set the dimmer switch to “” or “”.
• Measure the voltage (DC 12 V) of yellow
1
or green
2
at the headlight coupler
(wire harness end) and yellow
4
at the
meter assembly coupler (wire harness
end).
• Is the voltage within specification?
This circuit is OK. The wiring circuit
from the main switch
to the headlight cou-
pler or meter assem-
bly couplers is faulty
and must be
repaired.
Dg G/L R/W
Ch R/G Y
B/W Lg
G/W Y/L
Ch R/G Y
G
G/L R/W
G/W Y/L
B/W Lg
4
5

Yamaha XT660R S Specifications

General

Displacement	660 cc
Bore x Stroke	100.0 mm x 84.0 mm
Compression Ratio	10.0:1
Fuel System	Fuel Injection
Ignition System	TCI
Starter System	Electric
Transmission System	5-speed
Final Drive	Chain
Front Suspension System	Telescopic forks
Front Tyre	90/90-21 M/C 54S
Rear Tyre	130/80-17 M/C 65S
Overall Width	865 mm
Overall Height	1, 230 mm
Seat Height	865 mm
Wheelbase	1, 505 mm
Wet Weight	181 kg
Fuel Tank Capacity	15 litres
Oil Tank Capacity	2.9 litres
Engine Type	Liquid-cooled, 4-stroke, single cylinder, SOHC
Maximum Power	48hp (35kW) @ 6, 000rpm
Frame	Steel diamond
Rear Suspension System	Swingarm, (link suspension)
Front Brake	Single 298mm disc, 2-piston caliper
Rear Brake	Single Disc, 245 mm