Following reference numbers refer to "Wiring diagram", Sect. P 1.

As the starter motor is reliable and compact, it usually does not fail. In case of troubles, ensure that the starter motor cable terminal is properly tightened under the nut and shows no oxidation. If the terminal is properly tightened and free from oxidation, remove the starter motor and test it under loadless conditions (no load applied to the shaft). Secure the starter motor to a test bench. Ensure not to damage motor case. Use a 12V fully-charged battery. Take battery-motor connection cables not longer than 70 cm and having the same cross-section as the motorcycle connection cable. Connect the negative terminal of the battery with an unpainted area of the motor case and the positive terminal to its electric terminal. The motor shaft should rotate quickly and freely. Proceed with utmost care so not to short-circuit cables which are connected to the battery.

Remove generator cover (Sect. N 8, Removing the generator cover).

In the event the whole starting gears unit needs replacing, remove timing intermediate gears and starter motor intermediate gear (Sect. N 9.1, Removing the starter motor driven gear).

Disconnect starter motor / starter contactor cable (3) (see diagram in "Arrangement of wiring on frame", Sect. P 1).

Place gasket (2) and starter motor on casing and tighten screws (1) to the specified torque (Sect. C 3, Engine torque settings).

If the starting gears assembly was replaced, refit starter motor intermediate gear and timing intermediate gears (Sect. N 9.1, Reassembling the starter motor driven gear).

Close the generator cover (Sect. N 8, Reassembling generator cover).

Disconnect the battery (Sect. P 2, Battery).

Disconnect solenoid starter connector (2) from wiring (see diagrams in “Arrangement of wiring on frame”, Sect. P 1).

Apply a 12V (battery) across the positive (A) and negative (B) terminals of the connector.

Connect a multimeter between the two poles [threaded pins (+) and (-)] of the starter contactor and then check for electric continuity (Sect. P 9, Test equipment). If continuity is not ensured, replace the starter contactor.

Tighten the nuts (3) to the specified torque (Sect. C 3, Engine torque settings).

Refit the connector (2) to wiring (Sect. P 1, Arrangement of wiring on frame).

Fit the solenoid starter to the tank: push solenoid starter fully home, i.e until the four support tabs come out on the solenoid starter side.