88
6. ELECTRICAL
2. IGNITION SYSTEM
© Spark plugs
® Ignition coils
®
®
Fig. 270
® Condensers ® Battery
© Contact breaker
The ignition system consists of two ignition coils, two contact breakers, four spark plugs,
an ignition switch and a battery.
The current from the battery flows through the primary winding of the ignition coil, and
circuit is completed by grounding through the contact breaker . Contact breaker is contained
in the contact breaker housing at the right end of the crankshaft. There are two contact
breakers which are 180° out of phase. One of the breakers furnishes high voltage current
to spark plugs 1 and 4; the other breaker furnishes current to plugs 2 and 3. The contact
breakers ignite the spark plugs in a firing sequence of 1, 2, 4 and 3 which is indicated on
the high tension plug cords. Since no distributor is used, the construction is simple and
the system is easy to service.
SERVICE DATA
Ignition coil
3 point spark gap opening 7 mm min. (0. 27 in.)
Spark plug
Type (standard)
Plug gap
NGK D-7ES,
DENSO X22ES
O. 6-0. 7 mm (O. 023-0. 027 in.)
Contact breaker
Point gap
Spring force
0. 3-0.
4 mm (0. 012-0. 016 in.)
680-850 g (1. 43-1. 87 lbs.)
Condenser
Capacity
Insulation resistance
0. 24
µF±10%
Over 10 MO (1,000 megger)
Spark advancer
Start of advance (crankshaft d'eed)
Full advance (crankshaft spee )
Advanc e angle
l, 150 rpm
2, 300-2 . 500 rpm
25°
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