A.J.S. 16, Instruction Book

Page: 39 / 104

Illustration 19— Setting the ignition timing
Take up the timing rod, check piston position in case the engine has moved. Hold the
timing rod as vertically as possible through the sparking plug hole, verify piston is at
the top of the stroke. Make a mark on the timing rod flush with the top face of the
sparking plug hole, then withdraw the rod.
If the fully advanced method is used make a further mark on the timing rod exactly
½
" ABOVE the previous mark.
If the fully retarded method is used the second mark should be
8
" ABOVE the first one
Put the timing rod back through the sparking plug hole and by moving the rear wheel
turn the engine
BACKWARDS until the highest of the two marks on the timing
rod is flush with the top face of the sparking plug hole, dependent on the timing method
used.
Fit the contact breaker plate with the capacitor at 3 o'clock, lightly tighten the fixing
screws. The exact position of contact point separation is best determined by inserting
a strip of cigarette paper between the contact points and moving the plate in a clockwise
direction until the paper can be pulled away freely.
If a wedge is used to fully advance the unit, scribe a pencil line on the contact breaker
plate and a similar line on the plate housing both lines in register. Remove the contact
breaker plate, take away the wedge and re-fit the plate with the two scribed lines in
register, and firmly tighten the fixing screws.
As the ignition timing is important, a re-check should be made, before re-fitting the
sparking plug, rocker cover, etc.
TO REMOVE A N D REPLACE THE OIL PUMP PLUNGER IF
A N D W H E N NECESSARY ONLY—SINGLES
Remove
Lower end of rocker box oil feed pipe by unscrewing union nut.
Both oil pump end caps.
Oil pump plunger guide screw with pin. (See illustration 4.)
Oil pump plunger, by pushing at front and extracting from rear end of its housing.
Replace by:
Reversing above procedure.
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