Bedienungsanleitung Yamaha XV920 Virago (Seite 335 von 363) (Englisch)

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8B-14

Chapter 8 Part B Electrica! system (XV700-110Q models)

25.3a Check the reduction gears for wear or damage ...

damage (see illustrations). The gears aren't available separately, so

the starter will have to be replaced if they're worn or damaged.

26 Charging system testing - general information and

precautions

1 If the performance of the charging system is suspect, the system

asa whole should be checked first, followed by testing of the individual

components (the alternator and the voltage regulator/rectifier). Note:

Before beginning the checks, make sure the battery is fully charged

and that all system connections are clean and tight.

2 Checking the output of the charging system and the performance

of the various components within the charging system requires the use

of special electrical test equipment. A voltmeter or a multimeter are the

absolute minimum tools required. In addition, an ohmmeter is generally

required for checking the remainder of the system.

3 When making the checks, follow the procedures carefully to

prevent incorrect connections or short circuits, as irreparable damage

to electrical system components may result if short circuits occur.

Because of the special tools and expertise required, it is

recommended that the job of checking the charging system be left to a

dealer service department or a reputable motorcycle repair shop.

27 Charging system - output test

Caution: Never disconnect the battery cables from the battery while

the engine is running. If the battery is disconnected, the alternator and

regulator/rectifier will be damaged.

1 To check the charging system output, you will need a voltmeter or

a multimeter with a voltmeter function.

2 The battery must be fully charged (charge it from an external

source if necessary) and the engine must be at normal operating

temperature to obtain an accurate reading.

3 Attach the positive (red) voltmeter lead to the positive (+) battery

terminal and the negative (black) lead to the battery negative (-)

terminal. The voltmeter selector switch (if equipped) must be in 0-to-20

DC volt range.

4 Start the engine.

5 The charging system output should be within the range listed in

this Chapter's Specifications. Stop the engine as soon as the voltage

reading has been obtained, and turn the ignition key switch Off.

6 Follow the wiring harness from the alternator cover (on the left

side of the engine) to the electrical connector and disconnect the

connector containing the three white wires.

7 Connect the probes of an ohmmeter set to the R x 1 range

between each pair of white wires in the connector (the side that runs

back to the alternator, not the wiring harness side). Note the reading of

all three tests.

25.3b ... and check the bushing inside the gear end plate

28.2 Note the locations of the locating dowels as you

remove the cover

8 If each reading is not within the range listed in this Chapter's

Specifications, replace the stator (see Section 28).

9 If the reading is within the Specifications, refer to the Wiring

diagrams at the end of the book and check the charging circuit for

breaks or poor connections. If the wiring is good, replace the

regulator/rectifier (see Section 28). Note: No test details are providec

by the manufacturer for the regulator/rectifier unit. If the stator coils

and wiring check out OK, the regulator/rectifier is probably defective.

28 Alternator cover, stator, rotor and regulator/rectifier -

removal and installation

Cover

Refer to illustrations 28,2 and 28.6

1 Remove the outer crankcase cover from the left side of the

engine. Refer to Chapter 2 and disconnect the clutch cable at the

engine. Remove the left footpeg assembly if necessary for access.

2 Loosen the alternator cover mounting bolts evenly in a criss-cross

pattern and remove the cover (see illustration).

3 Clean all traces of old gasket sealer from the cover and its matin:

surface on the engine. •

4 Make sure there are no metal particles stuck to the rotor magnets

5 Position a new gasket over the dowels.

6 On XV1000 models, XV1100 models and 1986 and later XV70C

and XV750 models, hold the starter clutch thrust collar in with a flat

steel ruler or similar tool (see illustration).

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