APRILIA MSS Mana GT ABS, Service Station Manual

Page: 166 / 394

This section describes the operations to be carried out on the engine and the tools required.
Starter motor
The starter motor is sold as a complete part.
Before deciding on its replacement, it is necessary
to carry out the following checks:
- Battery
Check the voltage after a pause:
Voltage > 12.5 V
- Check the correct connection of the negative ter-
minals (battery negative and starter motor nega-
tive) between them and to the chassis.
- Recharge and if necessary, replace the battery.
- Connect the diagnostic tester (see the «injection» chapter).
Connect the induction clamp of an ammeter to the starter motor power supply positive cable.
Remove the 7.5A fuse No. 10 (see the «fuses» chapter).
Switch «ON» with the switch set in the «RUN» position and the side stand up.
Select the «PARAMETERS» function.
Command to start the engine (so that it cannot move) long enough to measure the rpm and starter
motor input.
NOTE
THE DECLARED RPM VALUE IS THAT INDICATED BY THE DIAGNOSTIC TESTER, THE RPM
READING IS NOT THE REAL ONE, BUT IT IS VALID FOR DIAGNOSIS PURPOSES.
Electric characteristic
Input at driving speed:
120 A
Engine speed
~300 ÷ 400 rpm
The start-up system has a gear between the motor armature and the crankshaft equipped with a free-
wheel coaxial to the flywheel and the torque limiter on the intermediate shaft.
The torque limiter is calibrated at 100 Nm (73.76 lbf ft); this component protects the structure of the
engine and the start-up kinematic mechanism in the event of incorrect start-up procedure, resulting in
inverse rotation.
The freewheel is used for a sufficiently silent start-up.
The start-up control (energised remote control) is slaved to enabling signals by the side stand and the
emergency OFF/RUN switch, which does not allow starting given dangerous conditions.
The start-up control circuit is not controlled by the immobiliser system; therefore, before insisting on the
starter system in an abnormal way, check the immobiliser enabling switch.
Engine
MSS Mana GT ABS
ENG - 166