A.J.S. 8, 14, Инструкция, Страница: 22 / 60

Illustration 5
Automatic Ignition Advance Mechanism
(Approximate Ignition Setting)
TO CHECK THE TIMING
Position the engine as detailed for tappet adjustment. Remove the sparking plug, the
cover for the contact breaker and engage top gear.
Obtain a short length of stiff wire or wheel spoke about 5" long. Insert the wire through
the sparking plug hole, until it touches the piston crown. By slowly moving the rear
wheel backwards and forwards the top dead centre of the piston travel can be ascer-
tained. Keep the wire vertical as far as the plug hole will permit—make a mark on the
wire to register with the seating for the sparking plug on the cylinder head. Take out
the wire and make a further mark on it ¼" ABOVE the previous mark.
Put the wire through the sparking plug hole, then turn the engine
BACKWARDS until
the top mark on the wire registers with the seating for the sparking plug, the piston is
now ¼" before top dead centre.
A
s " hole is drilled in the contact breaker base plate to enable a small screwdriver to be
inserted, and engaged between the two bob weights for the automatic ignition control.
(See illustration 5).
Turning the screwdriver clockwise will separate the bob weights to the fully advanced
position. If the timing is correct the contact points should be just about to separate.
The exact point of separation can best be found by inserting a thin piece of cigarette
paper between the points, which when pulled lightly will be free when the contact
points separate.
TO ADJUST IGNITION TIMING
By slackening the two screws in the slotted holes on the contact breaker base plate, the
plate can be moved either clockwise or anti-clockwise to adjust the timing as required.
Move the plate clockwise to advance and use the method described for checking to obtain
the correct timing.
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