Ignition Coil; Condenser - Yamaha JT1 Series Service Manual

ELECTRICAL SYSTEM-Ignition Coil, Condenser
5-5 Ignition .Coil
Primary coil resistance value
Secondary coil resistance value ...
. . . . 4.9 !1 ±10% (20'C or 68' Fl
.. 11 K!1 ±10% 12o·c
or
68'Fl
I
For measuring methods, refer to Fig. 5-5-1)
Ignition coil
Fig. 5-5-1
Note:
When measuring the secondary coil resistance value, disconnect the plug cap. Other-
wise, the resistance of the 5KD noise suppressor incorporated in the plug will be added to
the tester reading.
Spark Test:
Remove spark plug from cylinder head and reconnect the high voltage lead. Then hold the
spaQ: plug approximately 7 mm away from the head and see if it sparks as you crank the
kickstarter.
If it sparks at 7 mm. or so, and has blue white color, the ignition coil should be considered
to be in good condition.
5-6 Condenser
The condenser instantly stores a static electric charge as the contact breaker points separate,
and the energy stored in the condenser discharges instantly when the points are closed. If it
were not for the condenser, an electric arc would jump across the separating contact points,
causing them to burn.
Burned contact points greatly affect the flow of current in the primary winding of the ignition
coil.
If the contact points show excessive wear, or the spark is weak {the ignition coil is in good
condition}, check the condenser.
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