Kawasaki KH250 (1972-1976) [118/129] Capacitor charge circuit
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Kawasaki KH250 (1972-1976) [118/129] Capacitor charge circuit

Kawasaki S3 (1974-1976) [118/129] Capacitor charge circuit

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116 The chip of magnet is very small but it has a strong magnetic flux So when it cut through the coils instantaneously the magnetic field in the coils changes so rapidly that a strong and sharp sine wave current is generated This pulse current is sharp enough to trigger die thyrister in die C D I unit without need of amplification The three signal coils send signal current to ignite the spark plug in each cylinder at proper timing current The two coils are matched so that a steady voltage is supplied to the ignition units at all speeds Ignition Timing Detecting Circuit C D I Unit 3 C D I UNIT 2 Capacitor Charge Circuit To charge the capacitor two coils of wire are mounted on the aluminum plate As the flywheel rotates the diree sets of permanent magnets cut through the coil windings and induces a strong alternating current of 200 220 volts at over 1 000 r p m The two capacitor charging coils are connected in series as shown in die following figure The upper coil has less windings than die lower coils At low r p m the lower coil generate a current strong enough to charge the capacitor in the C D I unit while the upper coil cannot supply enough current But as the engine revolution rises the charging current from the lower coil starts to decrease gradually because the coil windings have a large number of turns and cause the armature reaction a kind of resistance in the circuit But when low speed winding voltage starts dropping the upper coil high speed coil takes over and supplies sufficient voltage to charge the capacitor The high speed windings have fewer turns and much lower resistance and consequently do not become loaded down when supplying charge KH400 C D I unit consists of three sets of capacitor thyristor and rectifying diode for each cylinder When the thyristor is triggered i e receives a gating pulse it conducts and acts as a short circuit across the charged capacitor Con sequently the capacitor suddenly discharges through the ignition coil primary winding The fast rate of discharge in conjunction with the high turns ratio of the coil windings produces a 32 KV ignition spark a Detailed Operation When the excitor coil output voltage is at the polarity indicated in Fig 408 capacitor charge current flows through exciter coil black lead to ground up through the ignition coil primary and to the capacitor C Return current is from the other side of the capacitor through the diode D and up through the red lead back to the exciter coil When the signal coil is at the indicated polarity signal voltage is felt at the gate of the thyristor and the thyristor starts conducting to discharge the capacitor Signal current is from the signal generator winding through ground from cathode K to gate G of the thyristor Th and back to the generator After the thyristor starts conducting the capacitor discharges th rough the primary winding of the ignition coil to the ground and up through the thyristor b Ignition Timing The KH400 ignition system does not incor porates automatic timing advance This is because the signal voltage rises too sharp at all engine speeds and there is not much difference in time for the voltage to reach the level to trigger the thy ristor The ignition timing is set to ignite the spark plugs at 23 2 6 mm at piston position B T D C at 4 000 r p m with a slight max l 30 advance or retard at other speeds

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