Electric System; Charging Coils - Rotax 912 ULS 3 Operator's Manual

7.4) Electric system

General note

Charging coils

Effectivity: 912 Serie
OM Edition 2 / Rev. 0
See Fig. 4
The ROTAX 912 engine is equipped with a dual ignition unit of a
breakerless, capacitor discharge design, with an integrated gene-
rator.
The ignition unit needs no external power supply.
Two independent charging coils (1) located on the generator sta-
tor supply one ignition circuit each. The energy is stored in capa-
citors of the electronic modules (2). At the moment of ignition 2
each of the 4 external trigger coils (3) actuate the discharge of the
capacitors via the primary circuit of the dual ignition coils (4).
NOTE: The trigger coil (5) is provided for rev counter si-
gnal.
Firing order: 1-4-2-3.
5
3
1
Part
1
2
3
4
5
Fig. 4
BRP-Powertrain
Ignition circuit A
2
3
2
Ignition circuit B
charging coils
electronic modules
trigger coils for ignition signal
dual ignition coils
trigger coils for speed signal
4
4
4
4
Function
page 7-7
April 01/2010
00425