Removal
Warning! Before starting work, ensure the motorcycle is stabilised and adequately supported. This will help prevent it from falling and causing injury to the operator or damage to the motorcycle.
1. Remove the rider's seat.
2. Disconnect the battery, negative (black) lead first.
3. Drain the coolant as described on page 12.6.
Warning! Do not remove the coolant pressure cap when the engine is hot. When the engine is hot, the coolant inside the radiator is hot and also under pressure. Contact with hot coolant will cause scalds and skin damage.
1. Disconnect the top and bypass hoses at the thermostat housing.
1. Top hose; 2. Bypass hose
5. Release the fixings securing the thermostat housing to the cylinder head.
6. Withdraw the housing and collect the thermostat.
Inspection
1. Inspect the thermostat at room temperature. If the valve is open, the thermostat must be replaced.
2. To check the valve opening temperature, suspend the thermostat in a container of water together with a thermometer. Raise the temperature of the water until the thermostat opens. The thermostat should start to open at 88°C±5°C.
3. If the temperature at which thermostat opening takes place is incorrect, replace the thermostat.
Installation
1. Clean the mating surfaces of the cylinder head and thermostat housing.
2. Locate the thermostat into the head with the jiggle pin 15 degrees to the left of the fully upright position.
1. Thermostat; 2. Jiggle pin
3. Rotate the thermostat until the jiggle pin is in the fully upright position.
Note: When correctly positioned, the thermostat will fit snugly into the head, the jiggle pin will be in the twelve O-clock position and the thermostat will not turn any further clockwise.
4. Position a new O-ring to the thermostat housing and seat into the groove.
1. O-ring/groove
5. Locate the thermostat housing to the head, ensuring that the O-ring does not become detached. Tighten the fixings to 4 Nm.
6. Reconnect the top hose and secure with the hose clip
7. Reconnect the battery, positive (red) lead first.
8. Refit the rider's seat.
9. Refill the cooling system as described on page 12.7.