(c) To check the voltage at which the cut-out
operates, with the engine still running, the voltmeter
should be connected between the “D” terminal and
earth. Slacken the locknut (J, Fig. 69) on the cut-out
adjustment screw (K) and turn the screw in an anti-
clockwise direction until the cut-out contacts are seen
to close. Check the voltage at which the cut-out
operates and if necessary adjust by turning the screw
in a clockwise direction to raise the setting or anti-
clockwise direction to lower it. Set the cut-out so that
the contacts close at 6.2-6.6 volts. Tighten the
locknut after making the adjustment.
B (15) Ammeter, Type CZ27.
NOTE. On later models no ammeter is
fitted (see paragraph C6).
Ammeter – Testing in position.
(a) Take out the three screws securing the panel on
the back of the headlamp and lift the panel out of the
headlamp. With the engine stationary, check the
voltage between each terminal of the ammeter and
earth. Both readings should be the same. If there is
a reading at terminal “B” but not at terminal “A”, there
is a broken connection in the ammeter and a
replacement must be fitted.
Ammeter – Removal and Replacement.
(b) Unscrew the ammeter terminal screws (A, Fig.
70) and lift out the cable ends. Bend back the four
metal tags (B) securing the ammeter and remove it
from the panel. The procedure must be reversed
when fitting the replacement ammeter.
B (16) Battery, Type PUW7E.
When examining a battery, do not hold naked lights
near the vents as there is a danger of igniting the gas
coming from the plates. Remove the vent plugs and
see that the ventilating holes in each are quite clear.
A clogged vent plug will cause the pressure in the
cell to increase, due to gases given off during
charging and this may cause damage. Make sure
that the rubber washer is fitted under each vent plug,
otherwise the electrolyte may leak.
Battery – Topping-up.
(a) Once a month remove the battery lid, unscrew
the filler caps and pour a small quantity of distilled
water into each of the cells to bring the electrolyte
level with tops of the separators. Electrolyte must not
be added to the battery unless some is accidentally
spilled. Should this happen, the loss must be made
good with electrolyte diluted to the same specific
gravity as that in the cells. This should be measured
by means of a hydrometer.
Checking Battery Condition.
(b) The state of charge of the battery should be
checked by taking hydrometer readings of the
specific gravity of the electrolyte in the cells. The
specific gravity readings and their indications are as
follows:-
1.280-1.300 Battery fully charged.
About 1.210 Battery about half discharged.
Below 1.150 Battery fully discharged.
These figures are given assuming the temperature of
the acid is about 60
o
If the battery does not respond to a freshening
charge it must be put through what is known as a
“cycle”. First charge as described above for a period
of 10 hours, and then discharge it at the rate of 1.2
amperes down to a terminal voltage of approximately
5.4. The time taken to discharge should be 7-8
hours. If the battery discharged in a shorter time,
repeat the charging and discharging cycle. If the
efficiency of the battery is not improved by this
process there is probably an internal fault and the
battery should be replaced.
F.
Each reading should be approximately the same. If
one cell gives a reading very different from the rest it
may be that the electrolyte has been spilled or has
leaked from this particular cell or there may be a
short circuit between the plates. This will necessitate
a replacement battery being fitted. Wipe the top of
the battery to remove all dirt or water.
NOTE. Do not leave the battery in a
discharged condition. If a motor cycle is to be out of
use, the battery must first be fully charged, and
afterwards given a refreshing charge about every two
weeks.
Earthing Connections.
(c) check that the lead from the negative terminal is
securely connected to the cycle frame or other
suitable earth.
Charging.
(d) If the previous tests indicate that the battery is
merely discharged, and if the electrolyte level is
correct, the battery must be recharged from an
external supply. Charge the battery with a constant
current of 1.2 amperes until the specific gravity of the
electrolyte in the cells remain constant over a period
of 1-2 hours.
43
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