IGNITION
Page 2A-8 90-826883R2 JUNE 1998
MECHANICAL SPARK ADVANCE
Spark timing is changed (advanced/retarded) by rotating the trigger coil, which changes
the trigger coil position in relation to the magnets in the center hub of the flywheel.
Stator
The ignition stator located under the flywheel contains two stator windings. One low
speed winding and one high speed winding.
As the outer flywheel magnets pass the stator windings, a current is produced that
charges a capacitor in the ignition switch box.
Electronic Spark Advance Stator
52642
b
a
a - Low Speed Winding
b - High Speed Winding
Flywheel
b
a
c
57129
a
b
d
e
e
a - Center Hub Magnet
b - Outer Magnet
c - BLACK Stator Flywheel (2 Magnets)
d - RED Stator Flywheel (4 Magnets)
e - Spacers
The flywheel assembly (BLACK stator) contains two outer magnets (8 Pole) (4 Pulse),
and one center hub magnet. The outer magnets are needed for battery charge coil and
ignition charge coils. The inner hub magnet is for trigger coil.
Theflywheelassembly(REDstator)containsfouroutermagnets(10Pole)(5Pulse),and
onecenterhubmagnet.Theoutermagnetsareneededforbatterychargecoilandignition
charge coils. The inner hub magnet is for trigger coil.
NOTE: Commercial and service flywheels will have 2 additional spacers and a retaining
ring used only with the RED stator.
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