Yamaha XT660R User Manual

PERIODIC MAINTENANCE AND MINOR REPAIR
6-41
6
Engine overheating
WARNING
EWA10400
● Do not remove the radiator cap when the engine and radiator are hot. Scalding hot fluid and steam may be
blown out under pressure, which could cause serious injury. Be sure to wait until the engine has cooled.
● After removing the radiator cap retaining bolt, place a thick rag, like a towel, over the radiator cap, and then
slowly rotate the cap counterclockwise to the detent to allow any residual pressure to escape. When the hissing
sound has stopped, press down on the cap while turning it counterclockwise, and then remove the cap.
NOTE:
If coolant is not available, tap water can be temporarily used instead, provided that it is changed to the recommended coolant
as soon as possible.
Wait until the
engine has cooled.
Check the coolant level in the
reservoir and radiator.
The coolant level
is OK.
The coolant level is low.
Check the cooling system
for leakage.
Have a Yamaha dealer check
and repair the cooling system.
Add coolant. (See NOTE.)
Start the engine. If the engine overheats again, have a
Yamaha dealer check
and repair the cooling system.
There is
leakage.
There is
no leakage.
U5VKE1E0.book Page 41 Tuesday, July 18, 2006 1:00 PM

Yamaha XT660R Specifications

General

Displacement	660cc
Bore x Stroke	100.0 mm x 84.0 mm
Compression Ratio	10.0:1
Fuel System	Electronic Fuel Injection
Ignition System	TCI
Starter System	Electric
Transmission	5-speed
Final Drive	Chain
Rear Suspension	Swingarm
Front Tire	90/90-21
Rear Tire	130/80-17
Length	2, 240 mm
Width	865 mm
Height	1, 230 mm
Seat Height	865 mm
Wet Weight	181 kg
Fuel Capacity	15 liters
Lubrication System	Dry sump
Engine Type	Liquid-cooled, 4-stroke, SOHC, 4-valve
Front Suspension	Telescopic fork
Front Brake	Single disc, 298 mm
Rear Brake	Single disc, 245 mm
Maximum Power	35 kW (48 PS) @ 6, 000 rpm
Maximum Torque	58 Nm @ 5, 250 rpm