Checking The Thermostat; Installing The Thermostat - Yamaha XT660R S Service Manual

Temperature
a
1
2 New
3
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THERMOSTAT
EAS00462

CHECKING THE THERMOSTAT

1. Check:
• thermostat 1
Does not open at 71 ~ 85 °C (159.8 ~
185 °F) → Replace.
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a. Suspend the thermostat in a container filled
with water.
b. Slowly heat the water.
c. Place a thermometer in the water.
d. While stirring the water, observe the ther-
mostat and thermometer's indicated tem-
perature.
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1 Thermostat
2 Thermometer
3 Water
4 Container
È Fully closed
É Fully open
NOTE:
_
If the accuracy of the thermostat is in doubt,
replace it. A faulty thermostat could cause seri-
ous overheating or overcooling.
2. Check:
• thermostat cover
• thermostat housing (cylinder head)
Cracks/damage → Replace.
EAS00466

INSTALLING THE THERMOSTAT

1. Install:
• thermostat 1
• O-ring 2
• thermostat cover 3
NOTE:
_
• Install the thermostat with its breather hole
a facing up.
• Lubricate the O-ring with a thin coat of lith-
ium-soap-based grease.
6 - 6
COOL
M M MMM M M MMM M
L L LLL L L LLL L
New
10 Nm (1.0 m · kg, 7.2 ft · lb)
M MMM M MMM
L LLL L LLL