Norton Commando Workshop Manual

## Routine Maintenance

# K

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).
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).

### SECTION K14

### SPARK PLUGS

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.
The Champlon N7Y is recommendad for both Commando and Combat engines and supersedes the N6Y type previously recommended.
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.
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).

Before refitting the plugs, see that the sealing washers are sound, and clean the threads of the spark plug body.
A smear of graphite grease applied to the threads Of the plug will assist in subsequent removal.

### SECTION K15

### TYRE PRESSURES

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:

| Ib/sq.in. | Kg/sq.cm.
Commando with one 1 68 lb.(76.2 Kg) rider: | Front | 22 | 1.547
Rear | 24 | 1.687
Commando with two 168 lb. (76.2 Kg) riders: | Front | 24 | 1.687
Rear | 28 | 1.969
Commando with two 168 lb. (76.2 Kg) riders and pannier luggage up to 100 lb. (45.36 Kg): | Front | 28 | 1.969
Rear | 32 | 2.250

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