Table of Contents
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I
ID
Abbreviation for Inside Diameter
Ignition Advance
Condition of increasing the timing of the spark plug firing at higher engine RPMs
Ignition System (Battery Ignition)
(1959-1978) Component chain: battery-ignition switch- ignition coil- condenser- breaker points (cam activated) 1)
Ignition System (Electronic)
(1980 on) Components include a timing rotor/(timing cup), sensor plate or inductive pickup, ignition control module, ignition coil and spark plugs. Full electronic advance, inductive pickup generates pulses that are sent to the solid state Ignition Control Module (ICM). The ICM computes ignition timing advance/ coil dwell. In 1983, a Vacuum Operated Electric Switch (VOES) was added to switch between 2 different spark advance curves. 2)
Ignition System (Magneto)
(1959-1968) Components include an induction coil, rotor, condenser, circuit breaker and a circuit breaker cam. 3)
- (1959-1964) Magneto is mounted in a fixed position producing advanced spark timing only
- (1965-1968) Magneto is mounted on a movable plate allowing for spark timing retard also
The magneto is controlled manually by turning the left handlebar grip.
Ignition Timing
The moment at which the spark plug fires as expressed in the number of crankshaft degrees before the piston reaches TDC
Infinity
An open circuit. Zero continuity in an electrical path
