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IGNITION SYSTEM
DESCRIPTION
The GF 125 Engine is equipped with a new type ignition system. This new system further reduces timing fluctuations. It has
an "ignition timing control circuit"wich accurately controls the advance curve and maintains consistent timing independent of
high RPM fluctuation, magnetic force, temperature, and air gap.
ADVANTAGES OF CAPACITOR DISCHARGE IGNITION SYSTEM
� Trouble free operation due to elimination of contact breaker points which can become contaminated.
� Ignition timing is maintained properly at all times and require no maintenance.
� Free from arcing and provides the ignition coil with stable secondary voltage.
� Excellent vibration and moisture resistance.
OPERATION
When the magneto rotor rotates, an electric current is generated in the power source coil(L), and this charges the capaci-
tor(C
) via (D
).
1
1
On the other hand, when the rotor tip on the magneto rotor passes the pick-up coil, the currents(P
they flow to the ignition timing control circuit, and they are converted into one ignition signal. This signal is sent to the
(SCR),the (SCR) becomes ON, the circuit(C
is discharged instantly, a high voltage is induced in the ignition secondary coil(lg
gap.
When the engine is running slowly (N
the ignition signal is generated at the time ①(Fig. 2) when the current (P
the engine speed increases (N
(P
) according to the engine speed. At this time, the advance angle is (θ
1
At the time of high engine speed (N
③ when (P
) is generated. AT this time, this advance angle becomes(θ
2
MAGNETO
Rotor tip
Pick-up Coil
) → (SCR) → (lg
1
r/min or less Fig. 3), control by the ignition timing control circuit is executed so that
1
to N
r/min), control is executed so that the ignition signal ② is generated between (P
1
2
r/min and over), control is executed so that the ignition signal is generated at the time
2
Power Source Coil
P
P
2
1
)is formed, and as the electric energy stored in capacitor (C
1
) is generated and is sent to the (SCR). When
1
).
1
).
2
CDI UNIT
D
1
IGNITION TIMING
CONTROL CIRCUIT
Fig. 1
GENERAL INFORMA TION 1-4
) and (P
1
), and a spark crosses over the spark plug
2
IGNITION
COIL
C
1
lg
lg
1
SCR
)are generated,
2
)
1
) and
1
SPARK
PLUG
2
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