Engine start and battery charging system of motorcycle Aprilia RS125/3 (1998-2005)

Battery — installation and maintenance
Battery rating: 12V - 9 Ah. First-time installation and maintenance Remove the battery from the motorcycle; see 7.2.1. Remove plugs and breather cap. Fill cells with fluid having a specific weight of 1.3. Slow-charge the battery (at 1/10th of the...

Ignition system circuit and troubleshooting
Troubleshooting Check that the 7.5A and 20A fuses are in good condition. Check the spark plug and replace as required. Check the high-tension cable and the spark plug cover. Check the coil. Check the pick-up. Connect the green-brown wire to ground....

Ignition system test readings
Ignition coil test The coils may be checked using a hand-held multimeter. Check for continuity of the primary and secondary windings. The resistance readings found need not match standard values exactly. If the windings are in good working order,...

Charge system layout and power supply
Charge system test Start the engine and rev it up to 6000 rpm. Measure DC voltage across battery terminals using a multimeter set to the DC voltage scale. Switch on the low beam lights. Correct voltage reading is 13.5 to 15 Volts. Troubleshooting...

Charge system test readings
Flywheel test Disconnect the alternator wiring connector. Start the engine and rev it up to 5,000 rpm. Measure AC voltage across the three yellow wires using a hand-held multimeter. A reading below 53 V indicates a faulty alternator. Standard...

Starter circuit and troubleshooting
Troubleshooting Check the condition of the fuses. Check the starter button. Check the starter relay. Check the starter motor. Connect the green-brown wire to ground. If the starter is still working, check the stand/starter logic circuit; see 8.12.1....