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distilled water to maintain the level indicated
on the side of the transparent battery case. Do not
use tap water as this may contain impurities
harmful to the battery. Never use a naked light
when examining the cells. (See Fig. K9).
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If the machine is to be out of use for a lengthy
period, have the battery fully charged and give it
a short refreshing charge at 1 ampere about every
two weeks. This will suffice to keep the battery in
serviceable condition. When the battery is fully
charged, the specific gravity of the electrolyte
should be 1.270/.290 at 60°F (16°C).
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SECTION K14
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SPARK PLUGS
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It is most important to use the correct grade of
spark plug, as a spark plug with a low heat factor
can cause pre-ignition and subsequent damage to the
engine.
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The Champlon N7Y is recommendad for both
Commando and Combat engines and supersedes the N6Y
type previously recommended.
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To avoid damage to the insulator, use the plug
spanner provided in the tool kit to remove and
refit the spark plug, which should be firmly
tightened to ensure a gas tight joint.
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To adjust or reset the spark plug gap, this is
affected by bending the earth, or side wire, which
is ductile. Do not attempt to bend the centre
electrode. The correct plug gap is 0.023 in. to
0.028 in. (0.59 mm to 0.72 mm).
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Before refitting the plugs, see that the sealing
washers are sound, and clean the threads of the
spark plug body.
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A smear of graphite grease applied to the
threads Of the plug will assist in subsequent
removal.
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SECTION K15
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TYRE PRESSURES
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Tyres produced by two different manutacturers
are used, in pairs, on Commando models. Due to the
different characteristics of the tyre walls,
although varying tyre pressures are advantageous
under certain circumstances, the front and rear
tyre pressures must remain equal for Avon tyres but
not for Dunlop. We therefore recommend a minimum
tyre pressure of 26 p.s.i. for Avon tyres front and
rear. In the case of Dunlop tyres the following
pressures are approved:
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Ib/sq.in.
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Kg/sq.cm.
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Commando with one 1 68 lb.(76.2 Kg)
rider:
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Front
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22
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1.547
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Rear
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24
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1.687
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Commando with two 168 lb. (76.2 Kg)
riders:
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Front
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24
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1.687
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Rear
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28
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1.969
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Commando with two 168 lb. (76.2 Kg)
riders and pannier luggage up to 100 lb.
(45.36 Kg):
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Front
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28
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1.969
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Rear
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32
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2.250
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