IGNITION TIMING (MAGNET
(Assuming that the magneto
is
in position and the timing cover
is
removed).
Magneto Wheel. Unscrew the securing nut and screw into the gear centre the
w,thdrawal tool
DA50/1
which is supplied with the toolkit. When the tool is in
position, tighten the centre bolt and the gear will be withdrawn from the shaft.
set
the contact breaker points to
,012
ins. fully open.
Sparking Plugs. Remove both plugs.
I
piston Positioning.
Unscllew the rocker inspection cap.
Engage
TOP
gear and
then rotate the rear wheei in the correct direction for forward travel, watching the
valve operation in the
L.H.
(DRIVE SIDE) cylinder. When the INLET valve closes,
continue gently to rotate the rear wheel until the piston reaches the top of the
rrroke (this is known
as
"TOP DEAD CENTREw-T.D.C.). The correct piston
position can be felt with the timing stick by rocking the
rear
wheei to and fro. When
the T.D.C. has been found, mark the lowest part of the timing stick which is visible
at'eye level and remove the stick; make
a
further mark (&"or
(8
mm. or
9.5
mm.)
as
the case may be) above the
first
mark. Now re-insert the timing stick into the
cylinder and rotate the rear wheel backwards until the piston has fallen about
1"
(2.5
cms.), then reverse the rotation and slowly bring the piston up to the desired
mark on the timing stick. This procedure eliminates any error due to backlash in the
tim~ng gears.
CAM
IN
FULLY
ADVANCED
POSlTiON
Fig.
22.
MAGNETO
IN
TIMING POSITION
67
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