Cdii
Ignrtio~~ Timing
Posiiio-.--
,,;,,g
the Co-tact Preakcr.
P,emove the contact breaker co?er and
advance the manual controi lever on the handlebar (close anti-clockwise to advance).
Rotate the contact breaker until the points are in the upper position and just breaking
(See Fig. 22). In order to ascertain accurately the exact point of opening, slip a
0.0015"
(0.04 mm.) feeler gauge or a piece of tissue paper between the points.
Rotate the contact breaker and the gauge will be released immediately the points
start to open.
Magneto Gear. Carefully retain
the contact breaker in the set position and
fit
the gear to the magneto shaft (ensure that the shaft and gear bore
is
free from oil).
Tap the gear gently to engage the taper and
fit
and secure the washer and nut.
Automatic
Timing
Device (A.T.D.). ST and 6T machines with magneto ignition
are fitted with an automatic timing device. This
is
removed by unscrewing the central
bolt which has a self-extracting action. When replacing the unit hold the central
portion and twist the gear against the spring. Use a pencil as
a
wedge to hold
it
in
this position while fitting the unit to the shaft.
Final Operation. Re-check the timing and if correct, replace the timing cover.
contact breaker cover, sparking plugs, H.T. lead (See Fin. 22) and the four rocker
inspection caps.
Sparking Plug Leads. If the timing operation has been carried out correctly,
join the plug leads as follows:-
The lead nearest the engine to the R.H. cylinder (Timing side).
The opposite lead to the L.H. cylinder (Drive side).
IGNITION TIMING (COIL)
REPLACING THE DISTRIBUTOR AND DRIVING PINION
Replacing the Distributor, Adaptor and Coil. Assemble the distributor
complete with the clamping lever to the adaptor and tighten the retaining bolt.
FI~ the adaptor to the crankcase with the clamping nut and bolt towards rhe crankcase
and with the slotted head pointing downwards. Fit the lower retaining nut but do
not tighten at this stage.
Clamp the coil onto the bracket and ensure that the two bolts are tight. Assemble
the coil and bracket onto the upper two distributor adaptor studs and
fit
the re-
maining nuts.
Tighten up all three retaining nuts.
The distributor clamp nut and
bolt should be loose enough to allow the distributor to rotate for final positioning.
Replacing the Distributor Drive.
The position of the distributor should be
adjusted to give the easiest position for timing the ignition, and subsequent main-
tenance. Rotate the distributor body until the contact breaker points are approxi-
mately at
11
o'clock when looking from the left hand of the machine. Tighten the
lever clamping bolt in this position. If a long screwdriver
is
held against the slotted
head of the clamping bolt from the underside of the engine, the nut can be tightened
more easily. With R.H. cylinder (Timing Side) at T.D.C. on compression stroke
(both valves closed) rotate the rotor arm clockwise until the contact breaker points
are just beginning to open, when the rotor arm is pointing to the rear of the machine.
Holding the rotor arm in this position, slide the thrust washer, followed by the
drive pinion, onto the distributor shaft so that the hole in the pinion boss
lines up
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