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ELECTRICAL SYSTEMS
173
select a setting that doesn't exceed 10°/o of the
battery's ampere-hour capacity.
4. When you want to check the state ofcharge.
turn the charger off (or unplug it), disconnect
the leads and check the specific gravity. It
should be within the limits specified in
Figure
7.
If i t is, and remains stable for one hour. the
battery is charged.
5.
Install the battery. Connect the positive (+)
cable first, then the negative (-) ground.
IGNITION SYSTEM
Breaker Point Ignition Operation
Figure 8
is a schematic diagram of the
ignition circuit used on all models with contact
breaker point ignition.
The ignition system is equipped with 2 coils
and 2 sets of points, each of which fires 2 spark
plugs (wired in series) simultaneously. One of
the spark plugs in the pair is fired (harmlessly)
on the exhaust stroke.
Ignition takes place every 180" of crankshaft
rotation; each set of points opens every 360" of
crankshaft rotation. The firing order is 1-2-4-3.
The left set ofpoints fires cylinders No. 1 and 4:
the right set of points fires cylinders No. 2 and
3.
Because the ignition coil fires through 2
spark plugs wired in series, if one of the plugs
fails to fire, so will the other. If one plug
develops a weak spark, so will the other.
When the breaker points are closed. current
flows from the battery through the primary
winding o f t h e ignition coil, building a
magnetic field around the coil. The breaker
cam rotates and is adjusted so that the breaker
points open as the piston reaches the firing
position ("F" mark on the advancer plate).
BREAKER POINT
IGNITION SYSTEM
Contact breaker
4
' - u -
Condenser
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Zx550Kz550Kzx550

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