Chapter 7. Electrical; Ignition System; Lighting System; Wiring Circuit - Yamaha SL292C 1971 Service Manual

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ELECTRICAL -
Ignition System, Lighting System, Wiring Circuit
CHAPTER 7. ELECTRICAL
7-1 IGNITION SYSTEM
Current for the ignition system is provided by the magneto
assembly. The mag neto assembly consists of the mag-
neti zed r otating f lywheel and the primary source coi ls
(attached is the magneto backing plate). Th e action of the
rota ting flywheel generates a low voltage primary current in
the pri mary source coils. This current is t imed, by the
opening and closing of the ig nition poi nts, to pass t o the
seco ndary (higl1 vo ltage) coi ls at the correct moment. The
secondary coils convert the primary voltage into high
voltage current and deliver it through the high tension leads
to the spark plugs.
7-3 WIRING CIRCUIT
SL292C
7-2
LIGHTING SYSTEM
Lighting current is generated in a similar manner by the
lighting coil located on the point plate. The lighting system
is of a balanced output type design for the headlight and
taillight. Overloading of the lighting system by adding on
lighting equipment is not recommended. Because the
I ighting system is of a balanced output type, burning out of
either the headlight or taillight can result in a heavy surge
of electricity being forced to the remaining light bulb. The
remaining bulb can also burn out because of this surge.
Gy-0
G-Br R-Y-L-Br R-G/W-L-Br
OFF
0
x
x x
1
x
0
x x
2
x x
0
x
3
x x x
0
G
\-----.---------------~B------------------~
t------r--------------~y~-----------------t.J--y.,-+-~
B
Stop Switch
B_
y
L
y
y
..:=>--+-~~-B ______ ~MVl-----8~----~1-4-~--~B-----+----+-:
L L
Stop lamp 12V 23W
Tail lamp 12V 8W
G
G B
0
Gy
R/ W
R/W
B Y,__ _ _ __,
B/W
Fig. 7-1
-53-
0
Gy
B B
Kill Switch
f
Spark plug
Ignition coil
B - Black
L - Light Blue
Br - Brown
G - Green
Y - Yellow
Gy - Gray
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A/W- Red & White
High 12V 60W
Low 12V 60W
A/L - Red & Light Blue
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