Yamaha XT660R S Service Manual

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FI
2. Check:
• fuel pressure
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a. Remove the fuel tank.
Refer to “FUEL TANK” in chapter 3.
b. Connect the pressure gauge 1 to the
adapter 2.
c. Connect the fuel pressure adapter to the
fuel pump and fuel hose 3.
d. Connect the fuel pump coupler 4 and fuel
sender coupler 5 to the fuel pump.
Refer to “FUEL TANK” in chapter 3.
e. Set the main switch to “ON” and the engine
stop switch to “”.
f. Start the engine.
g. Measure the fuel pressure.
Out of specification → Replace the fuel
pump.
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Pressure gauge
90890-03153
Fuel pressure adapter
90890-03176
Fuel pressure
324 kPa (3.24 kg/cm
2
, 46.1 psi)
1
2
3
4
5
EAS00502
CHECKING AND ADJUSTING THE
THROTTLE POSITION SENSOR
NOTE:
Before adjusting the throttle position sensor,
the engine idling speed should be properly
adjusted.
THROTTLE BODY ASSEMBLY

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