52
8. IGNITION SYSTEM
The ignition system is a pointless flywheel magneto with automatic advancing characteristic.
Being different from the breaker point type ignition system, this system is completely free from such troubles
as starting-up failure due to dirty, burnt or corroded point surface.
8-1 IGNITION COIL INTERNAL CIRCUIT
8-2 BASIC THEORY
1) Revolution of the flywheel generates electricity on the
primary side of the ignition coil, and the base current I1
flows to the power transistor, Tr1 .
Current I1 turns the power transistor, Tr1
“
ON
”
and the
electric current I2 flows.
2) When flywheel reached the ignition timing, timing control
circuit transmit signal to turn on Tr2 and Tr1 turn off at
the same time, at the particular moment current in primary
coil cut off abruptly then high voltage is generated in
secondary coil and make spark in the spark plug.
3) Stop switch is to ground the primary current not to generate
current in secondary coil.
Primary Coil
Primary Coil
Secondary Coil
Spark plug
Primary Coil
S
to
p
s
w
it
c
h
Summary of Contents for EK13
Page 1: ...EK13 EK1 7 EK20 EK28 EK30 ...
Page 2: ...2 ...
Page 14: ...14 4 17 DIMENSIONS B Type D Type ...
Page 54: ...54 11 OIL SENSOR Not available ...
Page 65: ...65 15 2 ELECTRIC STARTER ...
