Yamaha XS650SG Specifications download pdf (Page 54)

CHAPTER 6.

ELECTRICAL

6-1. STARTER

A.Armature

1.

2.

3.

4.

If

the commutator surface is dirty, clean

with

#600

grit sandpaper as shown in the

drawing below.

After sanding,

wash thoroughly with

electrical contact cleaner and dry with

high-pressure air steam.

The mica insulation between commutator

segments should be 0.5

-

0.8 mm (0.02-

0.03 in). below the segment level. If not,

scrape to proper limits with appropriately

shaped tool. (A hacksaw blade can be

ground to fit).

Each commutator segment should show

zero ohm resistance to the others and at

least

3Ma

resistance to the core. If there

is less than

3MR

resistance to the core, or

one of segments is open, replace the

armature.

In addition, the armature can be placed

on a

“growler” (testing device) and

checked magnetically for internal shorts.

Follow manufacturer’s test recommenda-

tions.

If the commutator surface shows heavy

scoring, it can be turned down on a lathe

or commutator turning machine. Check

the specification chart for minimum

allowable commutator diameter. Recut

the mica after.

NOTE:

Should turning be required, check the

condition of the cover bearings, armature

electrical properties starter amperage draw

and rpm and, finally, carbon brushes.

B. Yoke

1.

2.

If the yoke area is dirty, clean with clean

solvent and dry with high-pressure air.

Yoke coil resistance is 0.05 ohm.

The coil should be show zero ohm resist-

ance, if it shows more than zero ohm,

replace it.

If the yoke shows leakage to ground (re-

sistance is less then 100

kn)

replace it.

NOTE:

Immediately after cleaning, the yoke may

show some insulation leakage. Wait for it

to thoroughly dry before checking or re-

installing.

C. Starter relay switch

1. Inspection

a. Disconnect starter relay leads at the relay.

b. Connect pocket tester leads to the relay

terminals (ohm x 1 scale).

c. Turn ignition ON (“1” position) and

engine stop switch to “RUN”.

d. Push starter button. The relay should

click once and the scale should read zero

ohm. If the relay clicks but the scale does

not read zero, the relay must be replaced.

1. Starter button “ON”

e.

-

50

-

If the relay does not click, check the wires

from the starter button and the battery

(red/white, blue/white). Turn ignition off.

Use (ohm x 1) scale on tester. The re-

sistance between these wires should be no

more than

3.5n.

If there is more

sistance,

the relay should be replaced.

re-

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