Prise out the cap on the top of the fork leg by means of the small hole provided for
the purpose, and with the aid of a tubular spanner unscrew the small nut thus
exposed. Then remove the large nut which carried the cap. Disconnect the
mudguard stay at the lower end of the fork leg, and unscrew the stud. Allow all the
oil to drain out, then apply the front brake and depress the forks a few times to drive
out any oil remaining in the system. Replace the drain stud and fibre washer.
Add ⅛ pint of an S.A.E. 20 oil to each leg (see lubrication list, page 20) and
replace the top nuts and cap.
Steering Head Adjustment
It is first necessary to raise the front wheel clear of the ground—this can best be
done by lifting the machine on its stand and putting some small weight on the rear of
the machine causing the rear wheel to rest on the ground. Test for play by grasping
the fork legs and attempting to push them backwards and forwards. If play can be
detected the head bearing requires adjustment.
Slacken the clip bolt on each fork leg below the lamp nacelle so that the bottom
yoke is free to take up a new position.
Release the steering head clip bolt Fig. 8, and tighten adjuster nut until any
slackness has been taken up. Do not over-tighten or steering will be stiff and the ball
races may be damaged. Finally, retighten the steering head clip bolt followed by
those on the bottom yoke. To check, hold the handlebars lightly and move them
round slowly, when the steering should be free and rotate smoothly.
Rear Suspension
The two suspension units each comprise a telescopic damper unit and a totally
enclosed coil spring. The hydraulic dampers require no attention whatsoever. They
are sealed during manufacture and if they suffer damage or become ineffective they
must be replaced.
The complete suspension units can be removed from the frame after detaching the
pivot bolts at the top and the retaining nuts at the bottom.
The swinging fork pivot is provided with grease nipples and should be thoroughly
lubricated every 1,000 miles.
THE ELECTRICAL SYSTEM
The ignition and lighting equipment is fed from the ignition generator, consisting
of a permanent magnet alternator which provides alternating current.
An A.C./D.C. trickle charge system is employed and of the three lighting coils
housed in the stator plate, the two lower coils are connected in series, with one end
earthed, to provide A.C. current for the main headlamp bulb. There is no headlight
unless the engine is running. The upper most coil is connected via a small full wave
rectifier to the battery and provides trickle charge current with the lamp switch in all
positions. The trickle charge system provides battery current to operate ignition,
parking lights, stop light and horn.
Emergency starting
For emergency starting, current is drawn from the lighting coils in the generator
and passes direct to the ignition coil via the contact breaker mechanism. The engine
can then be readily started, when the battery will receive a slightly higher charge rate
than normal, due to the ignition coil not requiring battery current.
27
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