Instruction manual

TO RE-TIME THE IGNITION

The maximum advance is ½" (39°).

Have available a stout screwdriver, or an old type tyre lever with turned up end, and a

piece of stout wire 5½" long.

Before setting the ignition firing point it is essential the magneto contact breaker points

are correctly adjusted. Therefore always check these first.

Serious damage may result from the ignition being set too far advanced. (Causing

detonation).

Check contact breaker points by :

Remove contact breaker cover.

Check setting of contact breaker points, and, if necessary, re-set same.

Set ignition firing point by :

Remove :—

The sparking plug high tension cable from plug.

The sparking plug.

The magneto chain case cover.

The rocker box tappet cover.

Unscrew, several turns, nut retaining magneto sprocket to camshaft. (No need to remove

nut).

Lever off sprocket until it is loose on the taper of the shaft. (Use stout screw-driver

or old type tyre lever.)

Turn over engine till both valves are closed.

Insert rod through sparking plug hole, feel piston, by rocking engine forwards or

backwards till it is felt the piston is at the top of its stroke.

Mark rod flush with top face of sparking plug hole. Remove rod and measure ½" above

the flush mark and record position on rod.

Place handlebar ignition control lever in fully advanced position.

Replace rod in sparking plug hole.

Slightly rotate engine BACKWARDS until upper mark on rod is flush with top face

of sparking plug hole. (To rotate engine, engage top gear and turn back wheel by hand.)

Rotate sprocket on magneto armature shaft, in anti-clockwise direction (as seen from

sprocket end of magneto), till the contact breaker points are just about to separate.

(To find the exact moment for the commencement of the point separation, place a piece

of tissue paper between the points and turn the armature shaft (by the sprocket on it)

until the paper is just released, and no more, upon a gentle pull.)

Tighten nut on camshaft and ensure engine, and/or magneto shaft, does not move in

doing so.

Re-check the setting which must be ½" before top dead centre. (With the ignition

handlebar control lever in the fully advanced position.)

See page 92 for particulars of special timing disc graduated in degrees.

Replace

Rocker box tappet cover, Contact breaker cover, Magneto chain case cover, Sparking

plug (see note on page 37 re graphite on sparking plug thread), and Sparking plug wire.