Section 12 ELECTRICAL SYSTEM
Subsection 01 (IGNITION SYSTEM)
IGNITION SYSTEM
GENERAL
NOTE: For DI and 4-TEC models, refer to ENGINE
MANAGEMENT section.
MAGNETO OUTPUT
ENGINE TYPE WATT
717
160 @ 6000 RPM
787 RFI
270 @ 6000 RPM
717 Engines
Unregulated AC current is produced in the mag-
neto by the battery charging coil. This AC cur-
rent is rectified and regulated by the charging sys-
tem. The resulting regulated DC current is used
to charge the battery.
Unregulated AC current is produced in the mag-
neto by the ignition generator coil for the ignition
system. This current is sent to the MPEM where
itisprocessedtothenbesenttotheignitioncoil.
The ignition generator coil, MPEM and the ignition
coil work together in this Digital CDI ignition sys-
tem.
787 RFI Engines
Unregulated AC current is produced by the mag-
neto. This AC current is rectified and regulated by
the charging system. The resulting regulated DC
is used to charge the battery.
The CPS, MPEM, ECU and the ignition coil work
together in this Digital Inductive ignition system.
All Engines
A 12 volts battery supplies the Multi-Purpose Elec-
tronic Module (MPEM) with DC current.
Refer to CHARGING SYSTEM.
Magneto System
The magneto is the primary sou
rce of electrical
energy. It transfor
ms magnetic field into electric
current (AC).
717 Engines
The flywheel contains 4 permanent magnets and
spins around the generating coil. This electric cur-
rent flows to the multi-purpose electronic module
(MPEM).
1
F00H0EA
2
1. Flywheel
2. Generating coil
787 RFI Engines
Crankshaft Position Sensor (CPS)
The CPS is an inductive speed sensor located on
themagnetohousingandisworkinginconjunc-
tion with a 60 teeth ring gear which has 2 teeth
missing on the gear. The inductive sensor regis-
ters the 58-tooth sequence.
An AC voltage is generated by the sensor and is
sent to the ECU to calculate the crankshaft posi-
tion and the engine speed.
smr2004-Complete Line Up 543
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