Yamaha XT660X Service Manual

6 - 3
COOL
RADIATOR
EAS00455
CHECKING THE RADIATOR
1. Check:
• radiator fins
Obstruction
→
Clean.
Apply compressed air to the rear of the radi-
ator.
Damage
→
Repair or replace.
NOTE:
_
Straighten any flattened fins with a thin, flat-
head screwdriver.
2. Check:
• radiator hoses
Cracks/damage
→
Replace.
3. Measure:
• radiator cap opening pressure
Below the specified pressure
→
Replace
the radiator cap.
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a. Install the radiator cap tester
1
and radiator
cap tester adaptor
2
and radiator cap
tester adaptor
3
to the radiator cap
4
.
b. Apply the specified pressure for ten sec-
onds and make sure there is no drop in
pressure.
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4. Check:
• radiator fan
Damage
→
Replace.
Malfunction
→
Check and repair.
Refer to “COOLING SYSTEM” in chapter 8.
Radiator cap opening pressure
110.0 ~ 140.0 kPa
(1.10 ~ 1.40 kg/cm
2
,
16.0 ~ 20.3 psi)
Radiator cap tester
90890-01325
Radiator cap tester adaptor
90890-01352
Radiator cap tester adaptor
90890-01497

Yamaha XT660X Specifications

General

Displacement	660cc
Bore x Stroke	100.0 mm x 84.0 mm
Compression Ratio	10.0:1
Fuel System	Fuel Injection
Ignition System	TCI
Transmission	5-speed
Final Drive	Chain
Rear Brake	Single disc, Ø 245 mm
Front Tyre	120/70 R17
Rear Tyre	160/60 R17
Maximum Power	48 HP (35.3 kW) @ 6, 000 rpm
Maximum Torque	58.4Nm (43.1lb-ft) @ 5, 250rpm
Front Suspension	Telescopic fork
Rear Suspension	Swingarm, (link suspension)
Fuel Tank Capacity	15 litres
Engine Type	Liquid-cooled, 4-stroke, single cylinder, SOHC, 4-valves