Motorcycle engine cooling and lube system Aprilia RS125/3 (1998-2005)

Removing the engine oil tank
Read 1.2.1 carefully. Torque wrench settings: Screw (4): 5 Nm (0.5 kg·m) Screws (5): 3 Nm (0.3 kg·m) Remove the seat; see 7.1.1. Disconnect the two connectors (1). Note.Place some paper underneath the fitting to collect any oil spillage. Release the...

Cooling system diagram
An engine-driven centrifugal pump accommodated in the engine circulates coolant through the system. The pump takes in the coolant from the bottom section of the radiator and directs it through the ducts into the cylinders and cylinder heads to cool...

Coolant change
Read 1.2.1 and 1.3.1 carefully. Change coolant every two years. Remove the left-hand side fairing; see 7.1.2. Lift the fuel tank; see 2.9.1. Place a container with capacity greater than 1 litre under the drain plug (1) to collect coolant. Release...

Radiator — removal and installation
Read 1.2.1 and 1.3.1 carefully. Torque wrench settings: Radiator to frame mounting screw (3): 10 Nm (1.0 kg·m). Removal Drain all coolant from the cooling circuit; see 5.2.1. Remove the right-hand side fairing; see 7.1.2. Release the hose clip...

Coolant thermistor — removal and installation
Read 1.2.1 and 1.3.1 carefully. Removal Lift the fuel tank; see 4.1.1. Remove the rubber cover (1). Disconnect the electrical connector (2). Unscrew and remove the thermistor (3). Installation Smear the thread of a new thermistor with LOCTITE® 574....

Thermostat — removal and installation
Read 1.2.1 and 1.3.1 carefully. Torque wrench settings: Cylinder head cover screws (5): 10 Nm (1.0 kg·m) Thermostat bridge retaining screws (6): 6 Nm (0.6 kg·m) Removal Drain all coolant from the cooling circuit; see 5.2.1. Remove the spark plug;...

Expansion reservoir — removal and installation
Torque wrench settings: Expansion reservoir retaining screw (1) 3 Nm (0.3 kg·m). Removal Drain the cooling circuit; see 5.2.1. Release and remove the screw (1). Remove the clip (2). Disconnect the tube (3) from the expansion reservoir (4). Remove...