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Yamaha XV1000 Virago Manual

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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).
… 335 …


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