Manual Yamaha XV920 Virago (page 318 of 363) (English)

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Chapter 8 Part A Electrical system (XV535 models)

8A-15

25.9 Check the commutator for cracks

and discoloring, then measure the

diameter and compare it with the

minimum diameter listed in this

Chapter's Specifications

25.10a Continuity should exist between

the commutator bars

25.10b There should be no continuity

between the commutator bars and the

armature shaft

25.11 There should be almost no

resistance (0 ohms) between the brushes

and the brush plate

25.12 There should be no continuity

between the brush plate and the brush

holders (the resistance reading should

be infinite)

25.18 Be sure the shims and washers

are in place on both ends of the

armature shaft

armature is defective.

11 Check for continuity between the brush plate and the brushes

(see illustration). The meter should read close to 0 ohms. If it doesn't,

the brush plate has an open and must be replaced.

12 Using the highest range on the ohmmeter, measure the resistance

between the brush holders and the brush plate (see illustration). The

reading should be infinite. If there is any reading at all, replace the

brush plate. <

13 Check the starter pinion gear for worn, cracked, chipped and

broken teeth. If the gear is damaged or worn, replace the starter motor.

Reassembly

Four-brush starter

14 Install the plastic brush holder into the housing. Make sure the

terminal bolt and washers are assembled in their original order. Tighten

the terminal nut securely.

15 Detach the brush springs from the brush plate (this will make

armature installation much easier). Install the brush plate into the

housing, routing the brush leads into the notches in the plate. Make

sure the tongue on the brush plate fits into the notch in the housing.

16 Install the brushes into their holders and slide the armature into

place. Install the brush springs.

Two-brush starter

17 Reinstall the brush plate in the end housing (see illustration

25.5).

All models

18 Install any washers that were present on the end of the armature

shaft (see illustration).

19 Install the end covers, aligning the previously applied match

marks (be sure to install the large O-rings between the starter housing

and end covers). Install the O-rings and washers (if equipped) on the

two through-bolts, then install the through-bolts and tighten them

securely.

26 Charging system testing - general information and

precautions

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

as a 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.

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Yamaha XV920 Virago Manual

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