Yamaha XMAX YP125R - Service manual > Thermostat (YP250R)

Removing the thermostat

Checking the thermostat

1. Check:

• Thermostat

Does not open at 80.5-83.5 ºC (176.9-182.3 ºF) → Replace.

a. Suspend the thermostat "1" in a container "2" filled with water.

b. Slowly heat the water "3".

c. Place a thermometer "4" in the water.

d. While stirring the water, observe the thermostat and thermometer's indicated temperature.

A. Fully closed

B. Fully open

TIP

If the accuracy of the thermostat is in doubt, replace it. A faulty thermostat could cause serious overheating or overcooling.

2. Check:

• Thermostat cover

Cracks/damage → Replace.

Installing the thermostat

1. Install:

• Thermostat

TIP

Install the thermostat with its breather hole "a" in the position shown in the illustration.

2. Fill:

• Cooling system

(with the specified amount of the recommended coolant)

3. Check:

• Cooling system

Leaks → Repair or replace any faulty part.

See also: