Figure 4-10. Magneto timing.

Figure 4-10. Magneto timing.

cylinder firing position of the magneto. Insert the

(2) Remove the spark plug from the number 1

ignition cable into the number 1 tower terminal as

cylinder. The firing order is marked on the

marked on the magneto end cap. Mount the

shrouding. Put your thumb over the spark plug

magneto in a vise thoroughly lined with soit cloths.

hole and crank the engine until the cylinder starts

Turn the magneto gear in a clockwise rotation,

on the compression stroke. This is indicated by air

tripping the impulse coupling, until the number 1

being compressed against your thumb as the piston

rises in the cylinder.

terminal sparks, then hold the gear in this position.

( 3 ) To set the piston on top-dead-center,

(6) Remove the magneto from the vise.

Mount the magneto and gasket (20, fig. 4-9) on the

continue cranking the engine until the DC mark on

engine, meshing the gears so that when the magneto

the flywheel is alined with the timing mark on the

is in place, the gear tooth marked with an X will be

shroud. The edge of the X-marked vane will also be

visible through the lower half of the inspection hole

alined with the timing mark. Hold the engine at this

in the gear cover. Refer to figure 4-10. Moderately

setting.

tighten the securing cap screw (6, fig. 4-9), lock

(4) Disconnect the oil line and remove the

washers (15, 17, and 19) and nuts (14 and 18).

pipe elbow from the gear cover at the magneto

Connect the spark plug cables.

mounting flange.

(7) Start the engine and idle it at 1400 50

(5) With the magneto still removed from the

rpm. If the engine fails to start, it is probable due to

engine, you must now determine the number 1